v3.24.1.u1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Investment $ 15.5 $ 13.0
Derivative Asset 13.8 25.6
Assets, Fair Value Disclosure 29.3 38.6
Deferred Compensation Liabilities 45.6 36.8
Derivative Liability 16.2 16.1
Other Liabilities, Fair Value Disclosure 61.8 52.9
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Investment 15.5 13.0
Derivative Asset 0.0 0.0
Assets, Fair Value Disclosure 15.5 13.0
Deferred Compensation Liabilities 0.0 0.0
Derivative Liability 0.0 0.0
Other Liabilities, Fair Value Disclosure 0.0 0.0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Investment 0.0 0.0
Derivative Asset 13.8 25.6
Assets, Fair Value Disclosure 13.8 25.6
Deferred Compensation Liabilities 45.6 36.8
Derivative Liability 16.2 16.1
Other Liabilities, Fair Value Disclosure 61.8 52.9
Debt, Fair Value 5,960.1 5,491.5
Level 2 | 2.50% convertible senior notes | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt, Fair Value $ 649.2 $ 572.6