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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, 2022
Dec. 31, 2021
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties $ 648.9 $ 762.2
Proved oil and natural gas properties 19,792.6 19,655.8
Gross capitalized costs 20,441.5 20,418.0
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (132.5) (131.1)
Proved oil and natural gas properties (12,122.9) (12,211.0)
Net capitalized costs 8,186.1 8,075.9
U.S.    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 494.6 602.8
Proved oil and natural gas properties 15,051.9 14,690.7
Gross capitalized costs 15,546.5 15,293.5
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (117.8) (109.1)
Proved oil and natural gas properties (8,873.6) (8,821.5)
Net capitalized costs 6,555.1 6,362.9
Canada    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 19.2 17.7
Proved oil and natural gas properties 4,684.8 4,865.1
Gross capitalized costs 4,704.0 4,882.8
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties 0.0 0.0
Proved oil and natural gas properties (3,208.0) (3,320.5)
Net capitalized costs 1,496.0 1,562.3
Other    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 135.1 141.7
Proved oil and natural gas properties 55.9 100.0
Gross capitalized costs 191.0 241.7
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (14.7) (22.0)
Proved oil and natural gas properties (41.3) (69.0)
Net capitalized costs $ 135.0 $ 150.7