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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Excess Tax Benefit from Share-based Compensation, Operating Activities | $ 2.7 |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities | 0.0 | $ 3.2 | $ 3.4
Cumulative Effect on Retained Earnings, Net of Tax | 1.0 |  |
Estimate of Revenue Recognized on Open Contracts Prior to Adoption of Revenue ASU [Member] | Restatement Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 40.0 |  |
Estimated Income Statement Reclassification of Postretirement Costs from Operating to Non-Operating for Adoption on ASU 2017-07 on Jan 1 2018 [Member] | Restatement Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 10.0 | $ 18.0 |
Estimate of Operating Income Recognized on Open Contracts Prior to Adoption of Revenue ASU [Member] | Restatement Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 5.0 |  |
Cumulative Effect Adjustment to Retained Earnings for Previously Recognized Income on Open Contracts, Net of Tax, Prior to Adoption of Revenue ASU [Member] | Restatement Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 4.0 |  |
Accounting Standards Update 2016-09 [Member] | Deferred Tax Asset [Domain] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (25.6) |  |
Accounting Standards Update 2016-09 [Member] | Valuation Allowance, Operating Loss Carryforwards [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 23.5 |  |
Accounting Standards Update 2016-09 [Member] | Previously Unrecognized Tax Benefits Due to NOL Carryforwards [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | 2.1 |  |
Accounting Standards Update 2016-09 [Member] | Forfeiture Rate Estimate Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 1.1 |  |

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