Other Comprehensive (Loss) Earnings - Changes in Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension and Postretirement Benefit Plans [Abstract]
Amortization or settlement of actuarial losses and prior service costs	$ 0.6	$ 0.6	$ 0.5
Tax benefit	(0.1)	0.0	0.0
Net of tax	0.5	0.6	0.5
Cash Flow Hedges [Abstract]
Net losses reclassified into earnings	1.4	0.5	1.0
Tax benefit	(0.3)	(0.2)	(0.1)
Net of tax	$ 1.1	$ 0.3	$ 0.9