CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 128.3	$ 148.4	$ 270.4	$ 281.9
Other comprehensive income (loss) before tax:
Change in cumulative translation adjustments	85.5	(21.2)	174.0	38.6
Net change in cash flow hedges	(3.9)	5.0	(6.6)	3.5
Net change in unrealized components of defined benefit plans	1.9	0.9	3.6	2.0
Other comprehensive income (loss), before tax	83.5	(15.3)	171.0	44.1
Tax effect allocated to other comprehensive income (loss)	(0.6)	(1.4)	(1.1)	(1.4)
Other comprehensive income (loss), net of tax	82.9	(16.7)	169.9	42.7
Comprehensive income (loss)	211.2	131.7	440.3	324.6
Less: Comprehensive (loss) income attributable to non-controlling interest	(0.6)	9.5	(3.3)	10.0
Comprehensive income attributable to controlling interest	$ 211.8	$ 122.2	$ 443.6	$ 314.6