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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, 2019 USD ($) | Dec. 31, 2021 AUD ($)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Global intangible low-taxed income | $ 67.0 | $ 0.0 | $ 6.1 |
AMT tax credit received | 1.2 | 46.9 |  |
Deferred tax assets, operating loss carryforwards, foreign | 15.8 |  |  | $ 1.6
Deferred tax assets, operating loss carryforwards, domestic | 2,600.0 |  |  |
Tax credit carryforward, amount | 1,300.0 |  |  |
Deferred tax assets, operating loss carryforwards, foreign, net | 491.6 |  |  |
Deferred tax assets, operating loss carryforwards, domestic, net | 534.2 |  |  |
Deferred tax assets, operating loss carryforwards, state and local | 85.2 |  |  |
Deferred tax assets, tax credit carryforwards, general business | 139.1 |  |  |
Valuation allowance, income tax | (2,120.8) | (2,287.3) |  |
Unrecognized tax benefits, period increase (decrease) | 1.9 |  |  |
Net unrecognized tax benefits | 11.0 | 9.1 |  |
Unrecognized tax benefits, gross interest and penalties (reversal) | 0.2 | (0.4) | 0.4 |
Unrecognized tax benefits, accrued gross interest and penalties | 5.7 | $ 5.4 | $ 5.8 |
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 | $ (900.0) |  |  |

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