Income Taxes - Components of Pretax Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of income before provision for income taxes and noncontrolling interest
Domestic	$ 195.0	$ 340.4	$ 509.5
Foreign	103.0	8.6	26.8
Income before income taxes and loss from equity method investment	298.0	349.0	536.3
Current provision (benefit):
Federal	153.3	219.0	223.6
States	16.8	25.9	23.9
Foreign	52.4	46.5	36.2
Total current provision (benefit)	222.5	291.4	283.7
Deferred (benefit) provision:
Federal	(199.1)	(250.0)	(199.3)
States	(9.7)	(13.6)	(13.6)
Foreign	(13.2)	1.4	(10.3)
Total deferred (benefit) provision	(222.0)	(262.2)	(223.2)
Total provision for income taxes	0.5	29.2	60.5
Income tax reconciliation
Expected provision at statutory rate	62.6	73.3	112.7
State taxes, net of federal benefit	3.6	7.0	12.0
Foreign income at different tax rates	(6.8)	(24.4)	(18.1)
R&D tax credits	(32.4)	(31.4)	(23.6)
Share-based compensation	(17.0)	(5.2)	(7.4)
Non-deductible compensation	5.7	5.1	4.0
Recognition of previously unrecognized tax benefits	(12.0)	0.0	(8.1)
Other	(3.2)	4.8	(11.0)
Total provision for income taxes	$ 0.5	$ 29.2	$ 60.5