Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 237.2	$ 209.4	$ 187.9
Other comprehensive (loss) income
Currency translation adjustments	(53.8)	(59.5)	19.6
Net unrealized pension and other benefit actuarial gains (losses) and prior service credits, net of tax	4.9	(3.4)	16.9
Net unrealized (losses) gains on financial instruments, net of tax	(5.3)	(17.5)	6.1
Other comprehensive (loss) income	(54.2)	(80.4)	42.6
Comprehensive income	$ 183.0	$ 129.0	$ 230.5