CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income from continuing operations attributable to common shareholders	$ 116.6	$ 56.6	$ 363.3	$ 134.2
Components of other comprehensive income (loss), net of tax
Currency translation adjustment	(24.8)	41.0	(52.1)	13.2
Changes in pension and postretirement plan assets and benefit obligation, net of tax	5.2	3.4	15.3	10.4
Other comprehensive (loss) income, net of tax	(19.6)	44.4	(36.8)	23.6
Comprehensive income before allocation to noncontrolling interests	97.0	101.0	326.5	157.8
Less: Noncontrolling interests in comprehensive income	(0.1)	0.1	0.6	0.0
Comprehensive income attributable to common shareholders	$ 97.1	$ 100.9	$ 325.9	$ 157.8