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, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount
Statutory U.S. federal income tax		$ 99.6	$ 121.2	$ 172.9
State income taxes, net of federal benefit		9.1	12.5	21.0
Foreign tax differential		5.8	2.9	4.6
Change in valuation allowances		6.4	1.3	4.9
Uncertain tax positions and interest		(0.8)	(19.2)	6.5
Global Intangible Low-Taxed Income ("GILTI")		2.7	3.2	1.5
Expiration of foreign tax credits		10.6	1.6	0.0
Stock compensation		(7.8)	(13.8)	(8.1)
Nondeductible compensation		12.7	14.6	5.1
Danish Tax Matter		(13.7)	0.0	0.0
Notional interest deduction		(14.0)	0.0	0.0
Permanent and other		(7.2)	(5.3)	(10.1)
Effective income tax provision	$ (4.8)	$ 103.4	$ 119.0	$ 198.3
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)		1.90%	2.20%	2.60%
Foreign tax differential (percentage)		1.20%	0.50%	0.60%
Change in valuation allowance (percentage)		1.40%	0.20%	0.60%
Uncertain tax positions (percentage)		(0.20%)	(3.30%)	0.80%
Global Intangible Low-Taxed Income (percentage)		0.60%	0.50%	0.20%
Expiration of foreign tax credits (percentage)		2.20%	0.30%	0.00%
Stock compensation (percentage)		(1.60%)	(2.40%)	(1.00%)
Nondeductible compensation (percentage)		2.70%	2.50%	0.60%
U.S./Danish settlement (percentage)		(2.90%)	0.00%	0.00%
Notional interest deduction (percentage)		(3.00%)	0.00%	0.00%
Permanent and other (percentage)		(1.50%)	(0.90%)	(1.30%)
Effective income tax provision (percentage)		21.80%	20.60%	24.10%

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