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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards, foreign | $ 2.5 |
Operating loss carryforwards, state and local | 17.2 |
Deferred tax assets |  |
Net operating loss carryforwards | 19.7 | $ 15.4
Tax credit carryforwards | 13.7 | 27.9
Restructuring and impairment charges | 0.1 | 2.9
Pension and deferred compensation | 28.3 | 46.4
Other | 14.3 | 19.5
Valuation allowance | (20.9) | (18.7)
Total deferred tax assets | 55.2 | 93.4
Deferred tax liabilities: |  |
Accelerated depreciation | 26.3 | 30.3
Tax on undistributed foreign earnings | 9.8 | 0.0
Other | 3.8 | 6.1
Total deferred tax liabilities | 39.9 | 36.4
Net deferred tax asset | 15.3 | $ 57.0
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 258.4 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 17.5 |
Operating loss carryforwards, not subject to expiration | 14.0 |
Year 2018 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 11.4 |
Year After 2018 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 247.0 |
Year 2020 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 0.9 |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 3.0 |
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 6.9 |
Research Tax Credit Carryforward [Member] | Year 2035 [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1.5 |
Research Tax Credit Carryforward [Member] | Year 2036 [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1.8 |
Research Tax Credit Carryforward [Member] | Year 2037 [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 1.8 |
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 2021 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 0.2 |
Research Tax Credit Carryforward [Member] | Year 2022 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 0.8 |
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 |

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