CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 51.0	$ 37.6	$ 150.7	$ 104.5
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	22.5	5.9	64.7	15.9
Defined benefit pension and other postretirement plan adjustments, net of tax of $(0.3), $0.3, $(0.7) and $0.9, respectively	(0.7)	0.6	(1.6)	2.2
Net loss on investment securities, net of tax of $(2.9)	0.0	0.0	(5.1)	0.0
Net (loss) gain on derivatives, net of tax of $(0.2), $(0.1), $(0.5) and $0.4, respectively	(0.6)	0.0	(1.8)	0.7
Other comprehensive income, net of tax	21.2	6.5	56.2	18.8
Comprehensive income	$ 72.2	$ 44.1	$ 206.9	$ 123.3