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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
U.S. federal corporate income tax rate (percent) | 21.00% | 35.00%
Tax effect for re-measurement of deferred tax balances as result of Tax Act |  | $ 31.9
Provisional income tax expense related to remeasurement of deferred taxes at newly enacted tax rate |  | 30.0
Net operating loss carryforwards | $ 225.1 | $ 210.3
Market capitalization used in net operating loss analysis | 124.5 |
Limitation on loss carryforward based Section 382 change in ownership | $ 3.0 |

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