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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, 2021
Dec. 31, 2020
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties $ 762.2 $ 805.7
Proved oil and natural gas properties 19,655.8 18,654.6
Gross capitalized costs 20,418.0 19,460.3
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (131.1) (119.5)
Proved oil and natural gas properties (12,211.0) (11,131.5)
Net capitalized costs 8,075.9 8,209.3
U.S.    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 602.8 646.0
Proved oil and natural gas properties 14,690.7 14,011.4
Gross capitalized costs 15,293.5 14,657.4
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (109.1) (105.0)
Proved oil and natural gas properties (8,821.5) (8,166.5)
Net capitalized costs 6,362.9 6,385.9
Canada    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 17.7 22.2
Proved oil and natural gas properties 4,865.1 4,619.4
Gross capitalized costs 4,882.8 4,641.6
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties 0.0 0.0
Proved oil and natural gas properties (3,320.5) (2,944.3)
Net capitalized costs 1,562.3 1,697.3
Other    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 141.7 137.5
Proved oil and natural gas properties 100.0 23.8
Gross capitalized costs 241.7 161.3
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (22.0) (14.5)
Proved oil and natural gas properties (69.0) (20.7)
Net capitalized costs $ 150.7 $ 126.1