Accumulated Other Comprehensive Income (Loss) - Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,583.9	[1]	$ 1,577.3
Other comprehensive income (loss) before reclassifications	33.1		(72.1)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	4.3		1.8
Balance at end of period	3,745.3		3,583.9	[1]
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(94.5)		(24.2)
Balance at end of period	(57.1)		(94.5)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	26.2		0.9
Other comprehensive income (loss) before reclassifications	(78.8)		25.3
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	0.0		0.0
Balance at end of period	(52.6)		26.2
Defined benefit pension plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(120.3)		(24.0)
Other comprehensive income (loss) before reclassifications	107.0		(96.0)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	1.4		(0.3)
Balance at end of period	(11.9)		(120.3)
Derivative financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(0.4)		(1.1)
Other comprehensive income (loss) before reclassifications	4.9		(1.4)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	2.9		2.1
Balance at end of period	$ 7.4		$ (0.4)

[1] See discussion in Note 1 - Basis of Presentation and Description of Business for further detail regarding the elimination of the International lag reporting.