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Discontinued Operations - Loss, Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Successor |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss from discontinued operations, net of income taxes | $ (1.3) |  |
Successor | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |
Assets: |  |  |
Other current assets | 0.6 |  |
Total assets classified as discontinued operations | 0.6 |  |
Liabilities: |  |  |
Accounts payable and accrued expenses | 70.7 |  |
Other noncurrent liabilities | 170.6 |  |
Total liabilities classified as discontinued operations | $ 241.3 |  |
Predecessor |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss from discontinued operations, net of income taxes |  | $ (4.1) |
Predecessor | Discontinued Operations, Held-for-sale or Disposed of by Sale |  |  |
Assets: |  |  |
Other current assets |  |  | $ 0.3
Total assets classified as discontinued operations |  |  | 0.3
Liabilities: |  |  |
Accounts payable and accrued expenses |  |  | 70.6
Other noncurrent liabilities |  |  | 170.0
Total liabilities classified as discontinued operations |  |  | $ 240.6

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