v3.8.0.1

Basis and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Tax Cuts And Jobs Act Of 2017, Income tax expense (benefit) | $ 0.2 | $ (140.0)

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