Other (Expense) Income, net - (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Net foreign exchange transaction (loss) gain	$ (5.9)	$ 8.3	$ 7.3
Bank fee expense	(5.8)	(5.4)	(5.7)
Net (loss) gain on disposals of property and equipment and other	(0.7)	(1.4)	0.1
Other, net	(6.1)	(2.2)	0.3
Other (expense) income, net	$ (18.5)	$ (0.7)	$ 2.0