CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Foreign currency translation adjustments, tax expense (benefit)	$ (0.4)	$ 1.1	$ (5.1)
Amortization of pension related costs, tax expense (benefit)	1.6	1.3	1.3
Pension re-measurement, tax expense (benefit)	0.3	4.1	3.3
Pension settlement, tax expense (benefit)			3.7
Pension curtailment gain, tax expense (benefit)	0.3
Reclassification into earnings of accumulated losses from the de-designated 2013 Interest Rate Swap, tax expense (benefit)	(1.4)
Revaluation of derivative financial instruments, net of reclassifications into earnings, tax expense (benefit)	$ (1.4)	$ 0.5	$ (1.0)