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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair value of long-term debt $ 817.3   $ 798.1      
Long-term debt, net of debt issuance costs 783.7   779.3      
Derivative, Notional Amount 2,300.0   2,070.0      
Foreign currency forward contracts, net notional value 860.0   1,210.0      
Investments, Fair Value Disclosure 795.5   740.8 $ 792.8   $ 794.9
Deferred compensation plan, contra-equity, shares held in trust 12.1   10.4      
Foreign Exchange Contract [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset, Fair Value, Gross Asset 11.9   15.2      
Derivative Asset, Fair Value, Gross Liability 0.0   (2.7)      
Derivative Liability, Fair Value, Gross Asset (3.0)   (3.2)      
Derivative Liability, Fair Value, Gross Liability 12.1   12.0      
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investments, Fair Value Disclosure 368.3   321.8      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investments, Fair Value Disclosure 0.0   0.0      
Foreign currency forward contract, current asset amount 11.9   12.5      
Foreign currency forward contract, current liability amount 9.1   8.8      
Deferred compensation plan assets 672.2   604.3      
Deferred compensation plan liabilities 645.9   576.1      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investments, Fair Value Disclosure 378.8 $ 367.8 367.3 $ 64.2 $ 438.1 $ 452.0
Foreign currency forward contract, current asset amount 0.0   0.0      
Foreign currency forward contract, current liability amount 0.0   0.0      
Deferred compensation plan assets 0.0   0.0      
Deferred compensation plan liabilities $ 0.0   $ 0.0