Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 249.8	$ 237.2	$ 209.4
Currency translation adjustments	(54.5)	(53.8)	(59.5)
Net unrealized pension and other benefit actuarial losses and prior service credits (net of tax)	8.1	4.9	(3.4)
Net unrealized losses on financial instruments (net of tax)	(4.1)	(5.3)	(17.5)
Total other comprehensive loss	(50.5)	(54.2)	(80.4)
Comprehensive income	$ 199.3	$ 183.0	$ 129.0