CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	$ 56.6	$ 72.6	$ 134.2	$ 246.1
Components of other comprehensive income (loss), net of tax
Currency translation adjustment	41.0	(33.7)	13.2	(29.8)
Changes in pension and postretirement plan assets and benefit obligation, net of tax	3.4	3.0	10.4	7.8
Other comprehensive income (loss), net of tax	44.4	(30.7)	23.6	(22.0)
Comprehensive income before allocation to noncontrolling interests	101.0	41.9	157.8	224.1
Less: Noncontrolling interests in comprehensive income	0.1	0.0	0.0	(0.1)
Comprehensive income attributable to common shareholders	$ 100.9	$ 41.9	$ 157.8	$ 224.2