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Income Taxes - Textual (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |  |  |  |
Tax Expense or Benefit Resulting from the Tax Cuts and Jobs Act | $ 1.2 |  |  |  |
Bonus Depreciation Deductions, Tax Cuts and Jobs Act | 8.8 |  |  |  |
Tax expense at statutory rate (percent) |  | 35.00% | 35.00% | 35.00% |
Income tax benefit allocated to Capital in excess of par value |  | $ (25.1) | $ (4.2) | $ (11.7) |
Estimated realization of additional tax benefits |  | 51.3 | 0.1 | 0.3 |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions, Pre-Payment Claims Denials |  |  |  | 39.0 |
Changes to valuation allowance during the period |  | 7.9 | 0.3 | 4.6 |
Remaining valuation allowance | 35.8 | 35.8 | 27.9 |  |
Unrecognized income tax benefits | 0.3 | 0.3 | 2.8 | 2.9 | $ 0.9
Unrecognized tax benefits, decrease |  | 2.5 |  |  |
Unrecognized tax benefits that would have affected effective tax rate if recognized | 0.3 | 0.3 | $ 2.8 | $ 2.9 |
Federal [Member] |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 10.1 |  |  |  |
State [Member] |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 14.7 |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount, Tax Cuts and Jobs Act |  | 5.8 |  |  |
Net operating loss | $ 77.3 | $ 77.3 |  |  |

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity due to the Tax Cuts and Jobs Act + References No definition available. + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions related to our pre-payment claims denials. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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