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Supplemental Oil and Gas Information (Unaudited) - Capitalized Costs Relating to Oil and Gas Producing Activities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties $ 400.1 $ 648.9
Proved oil and natural gas properties 20,738.1 19,792.6
Gross capitalized costs 21,138.2 20,441.5
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (122.7) (132.5)
Proved oil and natural gas properties (12,829.4) (12,122.9)
Net capitalized costs 8,186.1 8,186.1
U.S.    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 337.3 494.6
Proved oil and natural gas properties 15,868.4 15,051.9
Gross capitalized costs 16,205.7 15,546.5
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (105.3) (117.8)
Proved oil and natural gas properties (9,552.9) (8,873.6)
Net capitalized costs 6,547.5 6,555.1
Canada    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 13.1 19.2
Proved oil and natural gas properties 4,716.0 4,684.8
Gross capitalized costs 4,729.1 4,704.0
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties 0.0 0.0
Proved oil and natural gas properties (3,233.7) (3,208.0)
Net capitalized costs 1,495.4 1,496.0
Other    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 49.7 135.1
Proved oil and natural gas properties 153.7 55.9
Gross capitalized costs 203.4 191.0
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (17.4) (14.7)
Proved oil and natural gas properties (42.8) (41.3)
Net capitalized costs $ 143.2 $ 135.0