Income Taxes (Significant Components of the Company's Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets:
Postretirement benefit obligation	$ 1.8	$ 2.0
Inventory	8.5	9.9
Net operating loss and credit carryforwards	11.4	16.1
Warranty reserve	0.3	0.4
Accrued litigation	0.1	0.1
Compensation	4.7	4.2
Disallowed interest	2.7	0.0
Other	3.7	4.8
Total deferred income tax assets	33.2	37.5
Deferred income tax liabilities:
Depreciation and amortization	17.6	9.7
Pension	12.3	16.3
Intangible assets	16.1	16.6
Other	3.2	2.8
Total deferred income tax liabilities	49.2	45.4
Net deferred income tax liabilities prior to valuation allowances	(16.0)	(7.9)
Valuation allowances	(5.3)	(11.6)
Net deferred income tax liability	$ (21.3)	$ (19.5)