Income Taxes (Significant Components of the Company's Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Postretirement benefit obligation	$ 1.7	$ 1.8
Inventory	8.7	8.5
Net operating loss and credit carryforwards	11.6	11.4
Operating lease liabilities	13.8
Accrued litigation	0.0	0.1
Compensation	2.9	4.7
Disallowed interest	4.6	2.7
Other	4.8	4.0
Total deferred income tax assets	48.1	33.2
Deferred income tax liabilities:
Depreciation and amortization	21.0	17.6
Pension	13.9	12.3
Intangible assets	16.8	16.1
Right-of-use assets	13.5
Other	3.0	3.2
Total deferred income tax liabilities	68.2	49.2
Net deferred income tax liabilities prior to valuation allowances	(20.1)	(16.0)
Valuation allowances	(4.8)	(5.3)
Net deferred income tax liability	$ (24.9)	$ (21.3)