CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 60.9	$ 22.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	5.9	14.9
Defined benefit pension and other postretirement plan adjustments, net of tax of $(0.1) and $0.2	(0.1)	0.4
Net gain on investment securities, net of tax of $0.1	0.3	0.0
Net gain (loss) on derivatives, net of tax of $0.8 and $(0.2)	1.7	(0.7)
Other comprehensive income, net of tax	7.8	14.6
Comprehensive income	$ 68.7	$ 36.7