CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 122.4	$ 142.1
Other comprehensive income before tax:
Change in cumulative translation adjustments	91.6	88.4
Net change in cash flow hedges	0.4	(2.6)
Net change in unrealized components of defined benefit plans	0.8	1.7
Other comprehensive income, before tax	92.8	87.5
Tax effect allocated to other comprehensive income	(0.2)	(0.5)
Other comprehensive income, net of tax	92.6	87.0
Comprehensive income (loss)	215.0	229.1
Less: Comprehensive income attributable to non-controlling interest	1.5	4.0
Comprehensive income attributable to controlling interest	$ 213.5	$ 225.1