Accumulated Other Comprehensive Loss, Net of Tax Reclassification of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ (0.6)	$ 3.3	$ 5.2	$ 16.7
Losses on derivative instruments	0.6	0.6	1.8	1.7
Amortization of defined benefit pension and postretirement plan items	1.7	1.9	5.0	6.0
Tax effect	(0.6)	(0.6)	(1.5)	(1.7)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax	$ 1.1	$ 5.2	$ 10.5	$ 22.7