Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ 0.9	$ 0.7	$ 13.4	$ 0.3
Losses on derivative instruments	0.6	0.6	1.1	1.1
Amortization of defined benefit pension and postretirement plans items	2.0	1.8	4.1	3.5
Tax effect	(0.5)	(0.6)	(1.1)	(1.2)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax	$ (3.0)	$ (2.5)	$ (17.5)	$ (3.7)