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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 ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 AUD ($) | Dec. 22, 2017
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Alternative Minimum Tax Refund |  |  |  | $ 45.7 |  |  |
Remeasurement due to the Tax Cuts and Jobs Act | $ 0.0 | $ 473.5 |  | 0.0 | $ 9.5 |  |
Global intangible low-taxed income | 0.0 | 0.0 |  | 6.1 | 68.2 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  |  |  | 14.5 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic |  |  |  | 2,500.0 |  |  |
Tax Credit Carryforward, Amount |  |  |  | 1,500.0 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic, Net |  |  |  | 530.6 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  |  |  | 81.5 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax |  |  |  | 23.4 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business |  |  |  | 112.6 |  |  |
Valuation allowance, income tax |  |  |  | (2,068.4) | (2,094.3) |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  | 2.5 |  |  |
Net Unrecognized Tax Benefit |  |  |  | 16.5 | 14.0 |  |
Unrecognized Tax Benefits, Interest and penalties on Income Taxes Expense | 2.1 | 4.8 |  | 0.4 | 0.4 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  |  |  | 5.8 | 5.4 |  |
Deferred Income Taxes and Tax Credits | (262.3) | (99.6) |  | 39.4 | 35.5 |  |
Income tax provision (benefit) | $ (263.8) | $ (161.0) |  | 46.0 | $ 18.4 |  |
Australia |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  |  |  |  |  | $ 3,200.0 |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign, Net |  |  |  | 766.4 |  |  |
US and Australia Deferred Tax Assets [Domain] |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Valuation allowance, income tax |  |  |  | (2,100.0) |  |  |
US Deferred Tax Assets |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Valuation allowance, income tax |  |  |  | (900.0) |  |  |
Australia Deferred Tax Assets |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Valuation allowance, income tax |  |  |  | $ (1,200.0) |  |  |
Before Corporate Tax Rate Change |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Federal Corporate Tax Rate |  |  |  |  |  |  | 35.00%
After Corporate Tax Rate Change |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Federal Corporate Tax Rate |  |  |  |  |  |  | 21.00%
Scenario, Forecast |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |
Alternative Minimum Tax Refund |  |  | $ 23.4 |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  | $ 5.3 |  |  |  |

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