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Income Taxes - Reconciliation of Expected Federal Income Tax Benefit to Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Expected income tax (benefit) expense at U.S. federal statutory rate | $ (388.9) | $ (29.9) | $ 139.5
Changes in valuation allowance, income tax | 410.1 | (32.0) | (284.6)
Remeasurement due to the Tax Cuts and Jobs Act | 0.0 | 0.0 | 9.5
Changes in tax reserves | (7.7) | 3.0 | 2.1
Excess depletion | (14.5) | (19.3) | (28.5)
Foreign earnings repatriation | 0.0 | 76.1 | 0.0
Foreign earnings provision differential | 16.4 | 45.6 | 97.1
Global intangible low-taxed income | 0.0 | 6.1 | 68.2
Remeasurement of foreign income tax accounts | 2.9 | (0.1) | (0.2)
State income taxes, net of federal tax benefit | (6.8) | (13.2) | 3.2
Other, net | (3.5) | 9.7 | 12.1
Total income tax provision | $ 8.0 | $ 46.0 | $ 18.4

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