Income Tax - Unrecognized Tax Benefit (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year		$ 39.3	$ 28.0	$ 235.7
Additions for tax positions related to the current year		12.9	15.9	28.6
Additions for tax positions of prior years		0.8	1.9	0.0
Reductions for tax positions related to the current year		(2.0)	0.0	(24.1)
Reductions for tax positions of prior years		(1.7)	0.0	(48.9)
Settlements	$ (125.0)	0.0	(3.7)	(161.8)
Release due to statute expirations		(0.7)	(1.3)	(3.4)
Foreign currency adjustment		0.3	(1.5)	1.9
Balance at end of year	$ 28.0	$ 48.9	$ 39.3	$ 28.0