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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |
Federal tax rate | 21.00% |  | 35.00%
Provisional tax expense |  |  | $ 13.0
Net deferred tax assets |  |  | 8.3
One-time mandatory repatriation tax |  |  | $ 4.7
Effective tax rate | 27.30% | 35.90% |

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