Comprehensive Income - Schedule of Components of Other Comprehensive (Loss) Income and Income Tax Expense Allocated to Each Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss), Before Tax Amount	$ 1.0	$ 2.8	$ (0.4)	$ 6.2
Other comprehensive income (loss), Income Tax Expense	0.2	0.3	0.5	0.6
Other comprehensive income (loss), net of tax	0.8	2.5	(0.9)	5.6
Translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss), Before Tax Amount	0.4	2.2	(2.3)	4.6
Other comprehensive income (loss), Income Tax Expense	0.0	0.0	0.0	0.0
Other comprehensive income (loss), net of tax	0.4	2.2	(2.3)	4.6
Adjustment for Net Periodic Pension Plan and Other Postretirement Benefits Plan Cost
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss), Before Tax Amount	0.6	0.6	1.9	1.6
Other comprehensive income (loss), Income Tax Expense	0.2	0.3	0.5	0.6
Other comprehensive income (loss), net of tax	$ 0.4	$ 0.3	$ 1.4	$ 1.0