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Income Taxes - Reconciliation of Statutory Tax Rate to Effective Tax Rate (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amount        
Statutory U.S. federal income tax   $ 105.9 $ 99.6 $ 121.2
State income taxes, net of federal benefit   12.8 9.1 12.5
Foreign tax differential   8.0 5.8 2.9
Change in valuation allowances   (0.9) 6.4 1.3
Uncertain tax positions and interest   (3.0) (0.8) (19.2)
Global Intangible Low-Taxed Income ("GILTI")   2.0 2.7 3.2
Expiration of foreign tax credits   0.0 10.6 1.6
Stock compensation   (9.6) (7.8) (13.8)
Nondeductible compensation   15.1 12.7 14.6
Danish Tax Matter   0.0 (13.7) 0.0
Notional interest deduction   (2.2) (14.0) 0.0
Permanent and other   (9.5) (7.2) (5.3)
Effective income tax provision $ (4.8) $ 118.6 $ 103.4 $ 119.0
Percentage of Income Before Income Taxes        
Statutory U.S. federal income tax (percentage)   21.00% 21.00% 21.00%
State income taxes, net of federal benefit (percentage)   2.50% 1.90% 2.20%
Foreign tax differential (percentage)   1.60% 1.20% 0.50%
Change in valuation allowance (percentage)   (0.20%) 1.40% 0.20%
Uncertain tax positions (percentage)   (0.60%) (0.20%) (3.30%)
Global Intangible Low-Taxed Income (percentage)   0.40% 0.60% 0.50%
Expiration of foreign tax credits (percentage)   0.00% 2.20% 0.30%
Stock compensation (percentage)   (1.90%) (1.60%) (2.40%)
Nondeductible compensation (percentage)   3.00% 2.70% 2.50%
U.S./Danish settlement (percentage)   0.00% (2.90%) 0.00%
Notional interest deduction (percentage)   (0.40%) (3.00%) 0.00%
Permanent and other (percentage)   (1.90%) (1.50%) (0.90%)
Effective income tax provision (percentage)   23.50% 21.80% 20.60%