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Income Taxes - Textual (Details) $ in Millions, $ in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 AUD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 AUD ($)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |
Remeasurement due to the Tax Cuts and Jobs Act |  | $ 0.0 |  | $ 0.0 | $ 9.5 |
Global intangible low-taxed income |  | 0.0 |  | 6.1 | 68.2 |
AMT tax credit received |  | 46.9 |  |  |  |
Deferred tax assets, operating loss carryforwards, foreign |  | 15.0 |  |  |  | $ 2.1
Reduction of operating loss carryforwards |  |  | $ 1.3 |  |  |
Deferred tax assets, operating loss carryforwards, domestic |  | 2,800.0 |  |  |  |
Tax credit carryforward, amount |  | 1,400.0 |  |  |  |
Deferred tax assets, operating loss carryforwards, foreign, net |  | 590.8 |  |  |  |
Deferred tax assets, operating loss carryforwards, domestic, net |  | 580.3 |  |  |  |
Deferred tax assets, operating loss carryforwards, state and local |  | 76.3 |  |  |  |
Deferred tax assets, tax credit carryforwards, general business |  | 112.6 |  |  |  |
Valuation allowance, income tax |  | (2,287.3) |  | (2,068.4) |  |
Unrecognized tax benefits, period increase (decrease) |  | (7.4) |  |  |  |
Net unrecognized tax benefits |  | 9.1 |  | 16.5 |  |
Unrecognized tax benefits, gross interest and penalties (reversal) |  | (0.4) |  | 0.4 | $ 0.4 |
Unrecognized tax benefits, accrued gross interest and penalties |  | 5.4 |  | $ 5.8 |  |
Decrease in unrecognized tax benefits during the next twelve months |  | 2.2 |  |  |  |
Scenario, Forecast |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |
AMT tax credit received | $ 1.2 |  |  |  |  |
U.S. — federal |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |
Valuation allowance, income tax |  | (1,200.0) |  |  |  |
Non-U.S. |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |
Valuation allowance, income tax |  | $ (1,100.0) |  |  |  |

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