Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	[1]	$ 183.7	$ 303.0	$ 561.6
Other comprehensive (loss) income before tax:
Change in cumulative translation adjustments		(150.2)	272.1	(156.3)
Net change in cash flow hedges		0.9	(8.9)	7.9
Net change in unrealized components of defined benefit plans		14.2	31.9	(24.6)
Other comprehensive (loss) income, before tax		(135.1)	295.1	(173.0)
Tax effect allocated to other comprehensive (loss) income		(4.1)	(7.8)	7.6
Other comprehensive (loss) income, net of tax		(139.2)	287.3	(165.4)
Comprehensive income	[1]	44.5	590.3	396.2
Less: Comprehensive loss attributable to non-controlling interest		(7.4)	(114.8)	(13.9)
Comprehensive income attributable to controlling interest		$ 51.9	$ 705.1	$ 410.1

[1] See Note 15 for further details – includes tax effects where applicable.