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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | $ 1.8 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 14.7 |
Deferred tax assets |  |
Net operating loss carryforwards | 16.5 | $ 20.4
Tax credit carryforwards | 40.8 | 40.4
Pension and deferred compensation | 42.0 | 43.7
Other | 19.3 | 20.0
Valuation allowance | (20.1) | (22.1)
Total deferred tax assets | 98.5 | 102.4
Deferred tax liabilities: |  |
Accelerated depreciation | 35.0 | 36.8
Other | 5.4 | 7.7
Total deferred tax liabilities | 40.4 | 44.5
Net deferred tax asset | 58.1 | $ 57.9
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 265.8 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 8.9 |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 5.6 |
Tax credit carryforwards | 21.1 |
Year 2019 [Member] | Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 3.1 |
Year 2024 [Domain] | Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 3.7 |
Year 2016 [Domain] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 5.8 |
Year After 2016 [Domain] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 260.0 |
Year 2020 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.0 |
Year 2020 [Member] | Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 3.2 |
Year 2021 [Member] | Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 9.6 |
Year 2018 [Member] | Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.5 |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 3.2 |
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 11.0 |
Research Tax Credit Carryforward [Member] | Year 2032 [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.4 |
Research Tax Credit Carryforward [Member] | Year After 2032 [Domain] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 5.4 |
Research Tax Credit Carryforward [Member] | Year After 2023 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.4 |
Research Tax Credit Carryforward [Member] | Year 2029 [Domain] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.1 |
Research Tax Credit Carryforward [Member] | Year 2030 [Domain] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.0 |
Research Tax Credit Carryforward [Member] | Year 2031 [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 1.0 |
Research Tax Credit Carryforward [Member] | Year 2021 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 0.5 |
Research Tax Credit Carryforward [Member] | Year 2022 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 0.8 |
Research Tax Credit Carryforward [Member] | Year 2023 [Member] | State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 0.5 |
Research Tax Credit Carryforward [Member] | Year 2028 [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | $ 1.1 |

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