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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  | $ 288.9 |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  |  |  |  | (15.00%) | (2156.00%) |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  |  | (6.00%) | 2382.00% |
Effective Income Tax Rate Reconciliation, Gain on Early Extinguishment of Debt, Percent |  |  |  |  |  | (268.00%) |
Increase (decrease) in deferred tax asset valuation allowance |  |  |  |  | $ 15.9 | $ 261.5 |
Operating Loss Carryforwards |  |  | $ 791.3 |  |  | 791.3 |
Cancellation of debt income for tax |  |  |  |  | 15.3 | 32.5 |
Annual limitation of NOL carryforwards and tax credits generated prior to ownership change |  |  |  |  | 2.9 |  |
Provision (benefit) for income taxes | $ (0.1) | $ 0.1 | (0.1) | $ 0.2 | 0.0 | 0.1 |
Other Comprehensive Income (Loss), Tax |  |  |  |  | 0.0 | 0.0 |
Liability for Uncertain Tax Positions, Noncurrent | 0.2 |  | 0.3 |  | 0.2 | 0.3 | $ 0.4
Income Tax Examination, Penalties and Interest Expense Reduction |  |  |  |  | (0.1) | (0.1) |
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction |  |  |  |  | (0.1) |  |
Income Tax Examination, Penalties and Interest Accrued | 0.1 |  | $ 0.1 |  | $ 0.1 | $ 0.1 |
Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% | 35.00% |
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  |  |  | 2382.00% |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  |  | (6.00%) |  |
Increase (decrease) in deferred tax asset valuation allowance |  |  |  |  | $ 6.0 |  |
Operating Loss Carryforwards | 0.3 |  |  |  | 0.3 |  |
Tax Year 2018 [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards | 89.2 |  |  |  | 89.2 |  |
Business Interest Expense Carryforward | $ 10.1 |  |  |  | $ 10.1 |  |

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