Segment Information - Reconciliation to Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Income (loss) from continuing operations, net of income taxes	$ 411.3	$ (23.0)	$ 291.5	$ (100.7)
Depreciation, depletion and amortization	73.8	77.1	146.7	145.4
Asset retirement obligation expenses	12.7	15.1	27.7	31.0
Restructuring charges	0.2	2.1	1.8	4.2
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates	(0.6)	(0.5)	(1.2)	(2.0)
Interest expense	37.6	45.4	77.0	97.8
Net loss (gain) on early debt extinguishment	2.3	11.8	25.8	(15.3)
Interest income	(0.9)	(1.3)	(1.4)	(2.8)
Unrealized losses on derivative contracts related to forecasted sales	24.5	23.7	325.5	25.6
Unrealized losses on foreign currency option contracts	6.3	1.2	3.0	8.8
Take-or-pay contract-based intangible recognition	(0.7)	(1.1)	(1.4)	(2.2)
Income tax provision (benefit)	11.3	(4.8)	10.3	(6.6)
Adjusted EBITDA	$ 577.8	$ 122.1	$ 905.3	$ 183.2