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Income Taxes (Details) | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Retained Earnings Adjustments [Line Items] |
Unrecognized tax benefits | $ 0
Accounting Standards Update 2016-16 [Member] |
Retained Earnings Adjustments [Line Items] |
Cumulative Effect on Retained Earnings, Net of Tax | 5,100,000
Accounting Standards Update 2018-02 [Member] |
Retained Earnings Adjustments [Line Items] |
Cumulative Effect on Retained Earnings, Net of Tax | $ (22,700,000)

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