Segments - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting [Abstract]
Income before income taxes	$ 82.8	$ 75.8
Interest expense, net	39.4	35.8
Depreciation and amortization	91.9	82.4
EBITDA	214.1	194.0
Foreign exchange remeasurement gains (a)	0.0	(1.2)
Long-term employee benefit plan adjustments (b)	(0.5)	0.4
Termination benefits and other employee related costs (c)	(1.3)	0.8
Consulting and advisory fees (d)	0.0	(0.1)
Transition-related costs (e)	(0.2)	0.0
Offering and transactional costs (f)	0.2	(1.0)
Stock-based compensation (g)	8.4	10.4
Other adjustments (h)	0.3	0.2
Dividends in respect of noncontrolling interest (i)	(1.0)	(0.4)
Adjusted EBITDA	$ 220.0	$ 203.1