Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v3.22.2.2
Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Revolving Credit Facility    
Liabilities:    
Debt Instrument, Fair Value Disclosure $ 6.7  
2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 350.0 $ 350.0
2020 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 400.0 400.0
2019 Notes    
Liabilities:    
Long-term Debt, Gross   374.6
Debt Instrument, Fair Value Disclosure 374.7  
Series A Notes    
Liabilities:    
Long-term Debt, Gross 100.0 100.0
Level 1    
Assets:    
Cash and cash equivalents 234.1 446.1
Restricted cash 3.5 1.3
Cash and cash equivalents held for sale   3.5
Investments in rabbi trust 2.4 4.2
Derivative instruments 0.0 0.0
Liabilities:    
Derivative instruments 0.0 0.0
Level 1 | Revolving Credit Facility    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0  
Level 1 | 2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 268.7 349.0
Level 1 | 2020 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 394.5 422.8
Level 1 | 2019 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 349.6 421.3
Level 1 | Series A Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 2    
Assets:    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Cash and cash equivalents held for sale   0.0
Investments in rabbi trust 0.0 0.0
Derivative instruments 3.0 1.9
Liabilities:    
Derivative instruments 8.0 2.5
Level 2 | Revolving Credit Facility    
Liabilities:    
Debt Instrument, Fair Value Disclosure 6.7  
Level 2 | 2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 2 | 2020 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 2 | 2019 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 2 | Series A Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 97.6 107.6
Level 3    
Assets:    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Cash and cash equivalents held for sale   0.0
Investments in rabbi trust 0.0 0.0
Derivative instruments 0.0  
Liabilities:    
Derivative instruments 0.0 0.0
Level 3 | Revolving Credit Facility    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0  
Level 3 | 2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 3 | 2020 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 3 | 2019 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 3 | Series A Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Carrying Value    
Assets:    
Cash and cash equivalents 234.1 446.1
Restricted cash 3.5 1.3
Cash and cash equivalents held for sale   3.5
Investments in rabbi trust 2.4 4.2
Derivative instruments 3.0 1.9
Liabilities:    
Derivative instruments $ 8.0 $ 2.5