Annual report pursuant to Section 13 and 15(d)

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

v3.19.3
Retirement Benefits - Pension Plans and Defined Contribution Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Cash Flows        
Cash contribution to defined benefit retirement plans $ 10.3 $ 10.9 $ 90.6  
Defined Contribution Plans        
Employer's contribution to defined contribution plans (as a percent) 4.00%      
Expenses related to defined contribution plans $ 11.6 11.3 11.4  
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 [Member]        
Fair Value Measurements        
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) $ 1.0 (0.9)    
Other Postretirement Benefits Cost (Reversal of Cost) (0.1) 0.1 0.3 $ 0.3
Cash Flows        
Estimated cash contribution to defined benefit retirement plans 0.7      
Pension Plans Defined Benefit        
Cash Flows        
Cash contribution to defined benefit retirement plans 9.3 $ 10.0 $ 89.6  
Pension Plans Defined Benefit | Minimum        
Cash Flows        
Estimated cash contribution to defined benefit retirement plans $ 9.3      
Domestic Plan [Member]        
Fair Value Measurements        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.10% 3.40% 3.50%  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) $ (37.1) $ 14.7    
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 $ 280.6 $ 253.3 $ 262.4  
Estimated Future Benefit Payments        
2017 14.5      
2018 14.8      
2019 15.5      
2020 15.9      
2021 16.2      
2025-2029 $ 83.8      
Foreign Plan [Member]        
Fair Value Measurements        
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 1.50% 1.50% 0.50%  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) $ (22.6) $ (0.4)    
Employee and employer contributions $ 8.6 $ 9.0    
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 $ 33.5 $ 31.9 $ 31.4  
Estimated Future Benefit Payments        
2017   7.2    
2018   6.9    
2019   7.0    
2020   7.1    
2021   7.1    
2025-2029   32.1    
Foreign Plan [Member] | Cash equivalents | Level 1        
Fair Value Measurements        
Fair value of plan assets 4.3 2.4    
Foreign Plan [Member] | Cash equivalents | Level 2        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Cash equivalents | Level 3        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member]        
Fair Value Measurements        
Fair value of plan assets 33.5 31.9    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Level 1        
Fair Value Measurements        
Fair value of plan assets 28.5 27.4    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Level 2        
Fair Value Measurements        
Fair value of plan assets 2.6 2.1    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Level 3        
Fair Value Measurements        
Fair value of plan assets 2.4 2.4    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Cash equivalents        
Fair Value Measurements        
Fair value of plan assets 4.3 2.4    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Equity securities        
Fair Value Measurements        
Fair value of plan assets 7.5 7.3    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Equity securities | Level 1        
Fair Value Measurements        
Fair value of plan assets 7.5 7.3    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Equity securities | Level 2        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Equity securities | Level 3        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Government index funds        
Fair Value Measurements        
Fair value of plan assets 5.7 5.6    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Government index funds | Level 1        
Fair Value Measurements        
Fair value of plan assets 5.7 5.6    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Government index funds | Level 2        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Government index funds | Level 3        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Corporate bond funds        
Fair Value Measurements        
Fair value of plan assets 11.0 12.1    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Corporate bond funds | Level 1        
Fair Value Measurements        
Fair value of plan assets 11.0 12.1    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Corporate bond funds | Level 2        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Corporate bond funds | Level 3        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Real estate and real estate funds        
Fair Value Measurements        
Fair value of plan assets 2.4 2.4    
Foreign Plan [Member] | 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    
Foreign Plan [Member] | 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    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Real estate and real estate funds | Level 3        
Fair Value Measurements        
Fair value of plan assets 2.4 2.4    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Other        
Fair Value Measurements        
Fair value of plan assets 2.6 2.1    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Other | Level 1        
Fair Value Measurements        
Fair value of plan assets 0.0 0.0    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Other | Level 2        
Fair Value Measurements        
Fair value of plan assets 2.6 2.1    
Foreign Plan [Member] | Estimate of Fair Value Measurement [Member] | Other | Level 3        
Fair Value Measurements        
Fair value of plan assets $ 0.0 $ 0.0