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Income Taxes - Textual (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |  |  |
Tax Expense or Benefit Resulting from the Tax Cuts and Jobs Act | $ 13.6 |  |  |  |
Bonus Depreciation Deductions, Tax Cuts and Jobs Act | 8.8 |  |  |  |
Changes to valuation allowance during the period |  | $ 2.1 | $ (7.9) | $ (0.3) |
Remaining valuation allowance | 35.8 | 33.7 | 35.8 |  |
Estimated realization of additional tax benefits |  |  | 51.3 | 0.1 |
Unrecognized income tax benefits | 0.3 | 0.9 | 0.3 | 2.8 | $ 2.9
Unrecognized tax benefits, decrease |  |  | 2.5 |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  | 0.5 |  |  |
Unrecognized tax benefits that would have affected effective tax rate if recognized | 0.3 | 0.9 | $ 0.3 | $ 2.8 |
Federal [Member] |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 5.8 |  |  |  |
State [Member] |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 13.8 |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount, Tax Cuts and Jobs Act | $ 5.8 |  |  |  |
Net operating loss |  | $ 66.0 |  |  |

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