Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 71.0	$ 65.9
Other comprehensive income, before tax:
Foreign currency translation	43.1	40.6
Derivative instruments	7.9	0.6
Pension benefits	0.3	0.5
Other comprehensive income, before tax	51.3	41.7
Income tax provision related to items of other comprehensive income	1.3	0.2
Other comprehensive income, net of tax	50.0	41.5
Comprehensive income	121.0	107.4
Less: Comprehensive income attributable to noncontrolling interests	2.0	2.7
Comprehensive income attributable to controlling interests	$ 119.0	$ 104.7