Supplemental Oil and Gas Information (Unaudited) - Schedule of Capitalized Costs Relating to Oil and Gas Producing Activities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Oil and Gas, Capitalized Cost [Line Items]
Unproved oil and natural gas properties	$ 283.0	$ 400.1
Proved oil and natural gas properties	21,343.6	20,738.1
Gross capitalized costs	21,626.6	21,138.2
Accumulated depreciation, depletion and amortization
Unproved oil and natural gas properties	(131.7)	(122.7)
Proved oil and natural gas properties	(13,486.6)	(12,829.4)
Net capitalized costs	8,008.3	8,186.1
United States - Offshore
Oil and Gas, Capitalized Cost [Line Items]
Unproved oil and natural gas properties	247.3	337.3
Proved oil and natural gas properties	16,598.8	15,868.4
Gross capitalized costs	16,846.1	16,205.7
Accumulated depreciation, depletion and amortization
Unproved oil and natural gas properties	(111.0)	(105.3)
Proved oil and natural gas properties	(10,326.2)	(9,552.9)
Net capitalized costs	6,408.9	6,547.5
Canada
Oil and Gas, Capitalized Cost [Line Items]
Unproved oil and natural gas properties	6.6	13.1
Proved oil and natural gas properties	4,498.1	4,716.0
Gross capitalized costs	4,504.7	4,729.1
Accumulated depreciation, depletion and amortization
Unproved oil and natural gas properties	0.0	0.0
Proved oil and natural gas properties	(3,116.2)	(3,233.7)
Net capitalized costs	1,388.5	1,495.4
Other
Oil and Gas, Capitalized Cost [Line Items]
Unproved oil and natural gas properties	29.1	49.7
Proved oil and natural gas properties	246.7	153.7
Gross capitalized costs	275.8	203.4
Accumulated depreciation, depletion and amortization
Unproved oil and natural gas properties	(20.7)	(17.4)
Proved oil and natural gas properties	(44.2)	(42.8)
Net capitalized costs	$ 210.9	$ 143.2