v3.26.1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Investment $ 21.7 $ 19.1
Derivative Asset 9.0 4.0
Equity securities 0.0 41.0
Assets, Fair Value Disclosure 30.7 64.1
Deferred Compensation Liabilities 47.8 49.0
Derivative Liability 4.7 9.7
Liabilities, Fair Value Disclosure 52.5 58.7
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Deferred Compensation Investment 21.7 19.1
Derivative Asset 0.0 0.0
Equity securities 0.0 41.0
Assets, Fair Value Disclosure 21.7 60.1
Deferred Compensation Liabilities 0.0 0.0
Derivative Liability 0.0 0.0
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 9.0 4.0
Equity securities 0.0 0.0
Assets, Fair Value Disclosure 9.0 4.0
Deferred Compensation Liabilities 47.8 49.0
Derivative Liability 4.7 9.7
Liabilities, Fair Value Disclosure 52.5 58.7
Debt, Fair Value 7,526.2 6,999.6
Level 2 | 2.50% convertible senior notes | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Debt, Fair Value $ 597.4 $ 647.5