Annual report pursuant to Section 13 and 15(d)

Retirement Benefits - Pension Plans and Defined Contribution Plans (Details)

v3.20.2
Retirement Benefits - Pension Plans and Defined Contribution Plans (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Cash Flows          
Cash contribution to defined benefit retirement plans     $ 12.4 $ 10.3 $ 10.9
Defined Contribution Plans          
Employer's contribution to defined contribution plans (as a percent)     4.00%    
Expenses related to defined contribution plans     $ 15.3 11.6 11.3
Minimum          
Defined Contribution Plans          
Contribution vesting period     0 years    
Maximum          
Defined Contribution Plans          
Employer's matching contribution to defined contribution plans (as a percent)     6.00%    
Contribution vesting period     5 years    
Other Postretirement Benefits Plan          
Fair Value Measurements          
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)     $ 2.0 1.0  
Other Postretirement Benefits Cost (Reversal of Cost)     0.1 (0.1) 0.1
Cash Flows          
Estimated cash contribution to defined benefit retirement plans $ 0.7   0.7    
Pension Plans Defined Benefit          
Cash Flows          
Cash contribution to defined benefit retirement plans     10.0 $ 9.3 $ 10.0
Pension Plans Defined Benefit | Minimum          
Cash Flows          
Estimated cash contribution to defined benefit retirement plans 11.0   $ 11.0    
Domestic Plan          
Fair Value Measurements          
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate     3.00% 4.10% 3.40%
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)     $ (20.6) $ (37.1)  
Employee and employer contributions     $ 1.8 $ 1.8  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase     3.00% 3.00% 3.00%
Fair value of plan assets 297.9 $ 280.6 $ 297.9 $ 280.6 $ 253.3
Fair value of pension assets attributable to acquisitions     0.0 0.0  
Estimated Future Benefit Payments          
2017 15.5   15.5    
2018 15.7   15.7    
2019 16.2   16.2    
2020 16.5   16.5    
2021 16.7   16.7    
2026-2030 84.6   84.6    
Defined Contribution Plans          
Defined Benefit Plan, Benefit Obligation, Business Combination     $ 0.0 $ 0.0  
Foreign Plan          
Fair Value Measurements          
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate     0.30% 1.50% 1.50%
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)     $ (2.3) $ (22.6)  
Employee and employer contributions     $ 9.2 $ 8.6  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase     2.00% 2.00% 2.00%
Fair value of plan assets 43.8 33.5 $ 43.8 $ 33.5 $ 31.9
Fair value of pension assets attributable to acquisitions     7.6 0.0  
Estimated Future Benefit Payments          
2017   8.8   8.8  
2018   8.6   8.6  
2019   9.2   9.2  
2020   9.1   9.1  
2021   8.3   8.3  
2026-2030   41.6   41.6  
Defined Contribution Plans          
Defined Benefit Plan, Benefit Obligation, Business Combination     37.7 0.0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0.0 0.0 (4.7) (2.2)  
Foreign Plan | Cash equivalents | Level 1          
Fair Value Measurements          
Fair value of plan assets 5.6 4.3 5.6 4.3  
Foreign Plan | Cash equivalents | Level 2          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Cash equivalents | Level 3          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member]          
Fair Value Measurements          
Fair value of plan assets 43.8 33.5 43.8 33.5  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Level 1          
Fair Value Measurements          
Fair value of plan assets 36.7 28.5 36.7 28.5  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Level 2          
Fair Value Measurements          
Fair value of plan assets 3.3 2.6 3.3 2.6  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Level 3          
Fair Value Measurements          
Fair value of plan assets 3.8 2.4 3.8 2.4  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Cash equivalents          
Fair Value Measurements          
Fair value of plan assets 5.6 4.3 5.6 4.3  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Equity securities          
Fair Value Measurements          
Fair value of plan assets 12.4 7.5 12.4 7.5  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Equity securities | Level 1          
Fair Value Measurements          
Fair value of plan assets 12.4 7.5 12.4 7.5  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Equity securities | Level 2          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Equity securities | Level 3          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Government index funds          
Fair Value Measurements          
Fair value of plan assets 6.0 5.7 6.0 5.7  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Government index funds | Level 1          
Fair Value Measurements          
Fair value of plan assets 6.0 5.7 6.0 5.7  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Government index funds | Level 2          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Government index funds | Level 3          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Corporate bond funds          
Fair Value Measurements          
Fair value of plan assets 12.7 11.0 12.7 11.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Corporate bond funds | Level 1          
Fair Value Measurements          
Fair value of plan assets 12.7 11.0 12.7 11.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Corporate bond funds | Level 2          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Corporate bond funds | Level 3          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Real estate and real estate funds          
Fair Value Measurements          
Fair value of plan assets 3.8 2.4 3.8 2.4  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Real estate and real estate funds | Level 1          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Real estate and real estate funds | Level 2          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Real estate and real estate funds | Level 3          
Fair Value Measurements          
Fair value of plan assets 3.8 2.4 3.8 2.4  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Other          
Fair Value Measurements          
Fair value of plan assets 3.3 2.6 3.3 2.6  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Other | Level 1          
Fair Value Measurements          
Fair value of plan assets 0.0 0.0 0.0 0.0  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Other | Level 2          
Fair Value Measurements          
Fair value of plan assets 3.3 2.6 3.3 2.6  
Foreign Plan | Estimate of Fair Value Measurement [Member] | Other | Level 3          
Fair Value Measurements          
Fair value of plan assets $ 0.0 $ 0.0 $ 0.0 $ 0.0