Segment and Geographic Information - Reconciliation of Consolidated Income (Loss), Net of Income Taxes to Adjusted EBITDA (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income from continuing operations, net of income taxes	$ 816.0	$ 1,317.4	$ 347.4
Depreciation, depletion and amortization	321.4	317.6	308.7
Asset retirement obligation expenses	50.5	49.4	44.7
Restructuring charges	3.3	2.9	8.3
Asset impairment	2.0	11.2	0.0
Provision for NARM and Shoal Creek losses	40.9	0.0	0.0
Changes in deferred tax asset valuation allowance and reserves and amortization of basis difference related to equity affiliates	(1.6)	(2.3)	(33.8)
Interest expense	59.8	140.3	183.4
Net loss (gain) on early debt extinguishment	8.8	57.9	(33.2)
Interest income	(76.8)	(18.4)	(6.5)
Net mark-to-market adjustment on actuarially determined liabilities	(0.3)	(27.8)	(43.4)
Unrealized (gains) losses on derivative contracts related to forecasted sales	(159.0)	35.8	115.1
Unrealized (gains) losses on foreign currency option contracts	(7.4)	2.3	7.5
Take-or-pay contract-based intangible recognition	(2.5)	(2.8)	(4.3)
Income tax provision (benefit)	308.8	(38.8)	22.8
Total Adjusted EBITDA	$ 1,363.9	$ 1,844.7	$ 916.7