Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 68.2	$ 53.5	$ 190.3	$ 183.3
Currency translation adjustments	(0.4)	(2.9)	(11.0)	(35.7)
Net unrealized pension and other benefit actuarial gains and prior service credits	0.4	0.8	1.9	0.8
Net unrealized gains (losses) on financial instruments (net of tax)	1.7	3.6	0.2	(2.4)
Total other comprehensive income (loss)	1.7	1.5	(8.9)	(37.3)
Comprehensive income	$ 69.9	$ 55.0	$ 181.4	$ 146.0