Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, foreign	$ 2.8
Operating loss carryforwards, state and local	15.6
Deferred tax assets
Net operating loss carryforwards	18.4	$ 19.7
Tax credit carryforwards	10.5	13.7
Restructuring and impairment charges	0.0	0.1
Pension and deferred compensation	27.2	28.3
Other	11.4	14.3
Valuation allowance	(16.0)	(20.9)
Total deferred tax assets	51.5	55.2
Deferred tax liabilities:
Accelerated depreciation	31.3	26.3
Tax on undistributed earnings of subsidiaries	6.6	9.8
Other	2.0	3.8
Total deferred tax liabilities	39.9	39.9
Net deferred tax asset	11.6	$ 15.3
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	233.5
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	23.2
Operating loss carryforwards, not subject to expiration	20.2
Year 2018 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	11.6
Year After 2018 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	221.9
Year 2020 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	0.1
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	2.6
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	5.6
Research Tax Credit Carryforward [Member] | Year 2037 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	1.5
Research Tax Credit Carryforward [Member] | Year 2038 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	1.8
Research Tax Credit Carryforward [Member] | Year 2039 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	2.3
Research Tax Credit Carryforward [Member] | Year 2022 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	0.6
Research Tax Credit Carryforward [Member] | Year 2023 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	0.5
Research Tax Credit Carryforward [Member] | Year After 2023 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	$ 1.5