CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 55.2	$ 51.0	$ 154.9	$ 150.7
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(9.5)	22.5	(39.1)	64.7
Defined benefit pension and other postretirement plan adjustments, net of tax of $0, $(0.3), $0.1 and $(0.7), respectively	(0.2)	(0.7)	0.1	(1.6)
Net loss on investment securities, net of tax of $(2.9)	0.0	0.0	0.0	(5.1)
Net (loss) gain on derivatives, net of tax of $(0.1), $(0.2), $1.0 and $(0.5), respectively	(0.4)	(0.6)	2.5	(1.8)
Other comprehensive (loss) income, net of tax	(10.1)	21.2	(36.5)	56.2
Comprehensive income	$ 45.1	$ 72.2	$ 118.4	$ 206.9