v3.26.1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair value of long-term debt $ 819.2   $ 838.7      
Senior Notes 796.3          
Long-term debt, net of debt issuance costs 596.4   805.9      
Investments, Fair Value Disclosure 821.4   844.0 $ 833.7   $ 742.0
Deferred compensation plan, contra-equity, shares held in trust 13.8   13.8      
Long-term Debt, Current Maturities 199.9   0.0      
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 483.0   491.1      
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      
Derivative Asset, Fair Value, Gross Asset 14.8   5.8      
Derivative Liability, Fair Value, Gross Liability 14.9   14.2      
Deferred compensation plan assets 797.2   723.6      
Deferred compensation plan liabilities 786.6   731.4      
Business Combination, Contingent Consideration, Liability 0.0   0.0      
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 295.6 $ 305.7 304.7 293.1 $ 311.0 330.3
Derivative Asset, Fair Value, Gross Asset 0.0   0.0      
Derivative Liability, Fair Value, Gross Liability 0.0   0.0      
Deferred compensation plan assets 0.0   0.0      
Deferred compensation plan liabilities 0.0   0.0      
Business Combination, Contingent Consideration, Liability $ 17.0 $ 17.7 $ 17.2 $ 19.1 $ 37.5 $ 35.8