Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Loss from continuing operations, net of income taxes	$ (119.8)	$ (77.7)
Depreciation, depletion and amortization	72.9	68.3
Asset retirement obligation expenses	15.0	15.9
Restructuring charges	1.6	2.1
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates	(0.6)	(1.5)
Interest expense	39.4	52.4
Net loss (gain) on early debt extinguishment	23.5	(3.5)
Interest income	(0.5)	(1.5)
Unrealized losses on derivative contracts related to forecasted sales	301.0	1.9
Unrealized (gains) losses on foreign currency option contracts	(3.3)	7.6
Take-or-pay contract-based intangible recognition	(0.7)	(1.1)
Income tax benefit	(1.0)	(1.8)
Adjusted EBITDA	$ 327.5	$ 61.1