Income Taxes - Rollforward of Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Uncertain Tax Positions [Rollforward]
Beginning balance	$ 39.3	$ 21.4	$ 15.8
Additions based on tax positions related to the current year	16.6	8.0	4.4
Additions for tax positions of prior years	9.5	15.9	4.8
Settlements	0.0	0.0	(2.8)
Lapse of statute of limitations	(4.5)	(6.0)	(0.8)
Ending balance	$ 60.9	$ 39.3	$ 21.4