CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 56.1	$ 38.8	$ 99.7	$ 99.7
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(49.6)	36.3	(29.6)	42.2
Defined benefit pension and other postretirement plan adjustments, net of tax of $0.4, $(0.3), $0.1 and $(0.4), respectively	1.0	(0.8)	0.3	(0.9)
Net loss on investment securities, net of tax of $(3.0) and $(2.9), respectively	0.0	(5.4)	0.0	(5.1)
Net gain (loss) on derivatives, net of tax of $0.3, $(1.1), $1.1 and $(0.3), respectively	0.7	(2.9)	2.9	(1.2)
Other comprehensive (loss) income, net of tax	(47.9)	27.2	(26.4)	35.0
Comprehensive income	$ 8.2	$ 66.0	$ 73.3	$ 134.7