CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	$ 435.4	$ 181.1	$ 133.6
Components of other comprehensive income (loss), net of tax
Currency translation adjustment	(69.2)	70.4	11.5
Changes in pension and postretirement plan assets and benefit obligation, net of tax	96.0	(53.6)	(47.7)
Other comprehensive income (loss), net of tax	26.8	16.8	(36.2)
Comprehensive income before allocation to noncontrolling interests	462.2	197.9	97.4
Less: Noncontrolling interests in comprehensive income (loss)	0.6	(0.5)	(0.1)
Comprehensive income attributable to common shareholders	$ 461.6	$ 198.4	$ 97.5