Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 53.5	$ 55.8	$ 183.3	$ 156.5
Currency translation adjustments	(2.9)	(36.5)	(35.7)	(35.6)
Net unrealized pension and other benefit actuarial losses and prior service credits	0.8	1.5	0.8	1.2
Net unrealized gains (losses) on financial instruments (net of tax)	3.6	(9.4)	(2.4)	(11.5)
Total other comprehensive income (loss)	1.5	(44.4)	(37.3)	(45.9)
Comprehensive income	$ 55.0	$ 11.4	$ 146.0	$ 110.6