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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
	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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