Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 56.3	$ (5.4)	$ 103.3	$ 79.7
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	21.5	14.6	89.3	16.7
Unrealized gain (loss) on securities	0.2	0.6	(0.1)	0.3
Unrealized gain (loss) on derivatives	0.2	1.7	(1.1)	0.0
Unrealized gain (loss) on pension plan obligations	(0.3)	0.1	9.0	0.2
Other comprehensive income, before tax	21.6	17.0	97.1	17.2
Income tax (benefit) related to items of other comprehensive income	0.6	0.0	(2.0)	0.0
Other comprehensive income, net of tax	22.2	17.0	95.1	17.2
Comprehensive income	78.5	11.6	198.4	96.9
Less: Comprehensive income attributable to noncontrolling interests	1.4	2.2	6.1	4.5
Comprehensive income attributable to controlling interests	$ 77.1	$ 9.4	$ 192.3	$ 92.4