Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v3.21.2
Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure $ 350.0 $ 475.0
2020 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 400.0 400.0
2019 Notes    
Liabilities:    
Long-term Debt, Gross   374.5
Debt Instrument, Fair Value Disclosure 374.6  
Series A Notes    
Liabilities:    
Long-term Debt, Gross 100.0 100.0
$225.0 term loan    
Liabilities:    
Debt Instrument, Fair Value Disclosure   213.7
Level 1    
Assets:    
Cash and cash equivalents 446.1 302.2
Restricted cash 1.3 9.6
Cash and cash equivalents held for sale 3.5  
Investments in rabbi trust 4.2 3.9
Derivative instruments 0.0 0.0
Liabilities:    
Derivative instruments 0.0 0.0
Level 1 | 2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 349.0 0.0
Level 1 | 2020 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 422.8 429.0
Level 1 | 2019 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 421.3 409.0
Level 1 | Series A Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 0.0
Level 1 | $225.0 term loan    
Liabilities:    
Debt Instrument, Fair Value Disclosure   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  
Investments in rabbi trust 0.0 0.0
Derivative instruments 1.9 2.6
Liabilities:    
Derivative instruments 2.5 1.6
Level 2 | 2021 Notes    
Liabilities:    
Debt Instrument, Fair Value Disclosure 0.0 475.0
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 107.6 105.3
Level 2 | $225.0 term loan    
Liabilities:    
Debt Instrument, Fair Value Disclosure   213.7
Level 3    
Assets:    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Cash and cash equivalents held for sale  
Investments in rabbi trust 0.0 0.0
Derivative instruments
Liabilities:    
Derivative instruments 0.0 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
Level 3 | $225.0 term loan    
Liabilities:    
Debt Instrument, Fair Value Disclosure   0.0
Carrying Value    
Assets:    
Cash and cash equivalents 446.1 302.2
Restricted cash 1.3 9.6
Cash and cash equivalents held for sale 3.5  
Investments in rabbi trust 4.2 3.9
Derivative instruments 1.9 2.6
Liabilities:    
Derivative instruments $ 2.5 $ 1.6