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Income Taxes Textuals (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 AUD ($) | Jan. 01, 2018 USD ($) | Dec. 22, 2017
Successor |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Global intangible low-taxed income |  |  | $ 0.0 | $ 68.2 |  |  |  |
Alternative Minimum Tax Refund |  |  | 91.1 |  |  |  |  |
Remeasurement due to the Tax Cuts and Jobs Act |  |  | 473.5 | 9.5 |  |  |  |
Executive Compensation Tax Deduction |  |  | 0.5 |  |  |  |  |
Unrecognized Tax Benefits, Interest and penalties on Income Taxes Expense |  |  | 4.8 | 0.4 |  |  |  |
Change In Unrecognized Tax Benefit |  |  |  | 1.3 |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  | $ 3,700.0 |
Deferred Income Taxes and Tax Credits |  |  | (99.6) | 35.5 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  |  |  | 3,200.0 |  |  |  |
Tax Credit Carryforward, Amount |  |  |  | 1,700.0 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic, Net |  |  |  | 672.6 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  |  |  | 84.4 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  |  |  | 1.6 |  |  | 262.0 |
Tax Basis of Investments, Gross, Unrealized Depreciation |  |  |  |  |  |  | 543.1 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  |  |  | 45.5 |  |  | 91.1 |
Valuation Allowance Release |  |  | 85.6 | 5.5 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business |  |  |  | 112.8 |  |  | 112.8 |
Deferred Tax Assets, Capital Loss Carryforwards |  |  |  |  |  |  | $ 205.7 |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  |  |  | 14.2 |  |  |  |
Changes in deferred tax asset valuation allowance |  |  |  | $ (296.5) |  |  |  |
Tax Rate, Australia |  |  |  | 30.00% |  | 30.00% |  |
Net Unrecognized Tax Benefit |  |  | 12.7 | $ 14.0 |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  |  | 5.0 | 5.4 |  |  |  |
Income tax provision (benefit) |  |  | (161.0) | 18.4 |  |  |  |
Valuation allowance, income tax |  |  | (2,432.5) | (2,094.3) |  |  |  |
Successor | Australia |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign, Net |  |  |  | 795.4 |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  |  |  |  |  | $ 3,300.0 |  |
Successor | US Deferred Tax Assets |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Valuation allowance, income tax |  |  |  | (900.0) |  |  |  |
Successor | Australia Deferred Tax Assets |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Valuation allowance, income tax |  |  |  | (1,200.0) |  |  |  |
Successor | Maximum |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Executive Compensation Tax Deduction |  |  |  | 1.0 |  |  |  |
Operating Loss Carryforwards |  |  |  | $ 62.0 |  |  |  |
Successor | Non-U.S. |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Deferred Income Taxes and Tax Credits |  |  | 260.4 |  |  |  |  |
Successor | Before Corporate Tax Rate Change |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Federal Corporate Tax Rate |  |  |  |  |  |  |  | 35.00%
Successor | After Corporate Tax Rate Change |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Federal Corporate Tax Rate |  |  |  |  |  |  |  | 21.00%
Predecessor |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Cancellation of Debt Income | $ 8,500.0 |  |  |  |  |  |  |
Global intangible low-taxed income |  | $ 0.0 |  |  | $ 0.0 |  |  |
Remeasurement due to the Tax Cuts and Jobs Act |  | 0.0 |  |  | 0.0 |  |  |
Unrecognized Tax Benefits, Interest and penalties on Income Taxes Expense |  | 2.1 |  |  | 0.4 |  |  |
Operating Loss Carryforwards |  |  | $ 4,600.0 |  |  |  |  |
Deferred Income Taxes and Tax Credits |  | (262.3) |  |  | (97.0) |  |  |
Income tax provision (benefit) |  | $ (263.8) |  |  | $ (94.5) |  |  |
Predecessor | Third-party Lender |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Cancellation of Debt Income | 3,900.0 |  |  |  |  |  |  |
Predecessor | Related Party Lender |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |
Cancellation of Debt Income | $ 4,600.0 |  |  |  |  |  |  |

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