Consolidated Statements of Stockholder Equity (Deficit) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Pension adjustments, tax benefit (expense)	$ 1.8	$ 15.7	$ (39.0)
Change in cumulative translation adjustment, tax expense (benefit)	7.9	(9.9)	(1.6)
Investment hedge, tax expense (benefit)	(4.5)	0.9
Derivative financial instrument, tax expense (benefit)	$ (11.5)	$ 14.6	$ 2.8