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Recent Accounting Pronouncements Adoption of 2016-09 - Employee Share-Based Payment Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (4.1) | $ 1.0
Adjustments for New Accounting Pronouncement [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
Adjustments for New Accounting Pronouncement [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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