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 Income And Comprehensive Income [Abstract]
Net income	$ 88.2	$ 135.5	$ 358.6	$ 417.4
Other comprehensive income (loss) before tax:
Change in cumulative translation adjustments	57.9	(2.1)	231.9	36.5
Net change in cash flow hedges	(3.9)	1.2	(10.5)	3.9
Net change in unrealized components of defined benefit plans	1.9	1.2	5.4	3.2
Other comprehensive income (loss), before tax	55.9	0.3	226.8	43.6
Tax effect allocated to other comprehensive income (loss)	(0.6)	(0.4)	(1.6)	(1.0)
Other comprehensive income (loss), net of tax	55.3	(0.1)	225.2	42.6
Comprehensive income (loss)	143.5	135.4	583.8	460.0
Less: Comprehensive (loss) income attributable to non-controlling interest	(1.8)	1.0	1.6	11.0
Comprehensive income attributable to controlling interest	$ 145.3	$ 134.4	$ 582.2	$ 449.0