Comprehensive Income - Schedule of Components of Other Comprehensive Income and Income Tax Expense Allocated to Each Component (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 [Line Items]
Other comprehensive (loss) income, Before Tax Amount	$ 0.0	$ 1.0	$ 3.7	$ (0.4)
Other comprehensive (loss) income, Income Tax Expense	0.1	0.2	0.4	0.5
Other comprehensive (loss) income, net of tax	(0.1)	0.8	3.3	(0.9)
Translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Before Tax Amount	(0.4)	0.4	2.3	(2.3)
Other comprehensive (loss) income, Income Tax Expense	0.0	0.0	0.0	0.0
Other comprehensive (loss) income, net of tax	(0.4)	0.4	2.3	(2.3)
Adjustment for Net Periodic Pension Plan and Other Postretirement Benefits Plan Cost
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive (loss) income, Before Tax Amount	0.4	0.6	1.4	1.9
Other comprehensive (loss) income, Income Tax Expense	0.1	0.2	0.4	0.5
Other comprehensive (loss) income, net of tax	$ 0.3	$ 0.4	$ 1.0	$ 1.4