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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, 2020
Dec. 31, 2019
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties $ 805.7 $ 1,570.7
Proved oil and natural gas properties 18,654.6 17,490.4
Gross capitalized costs 19,460.3 19,061.1
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (119.5) (387.7)
Proved oil and natural gas properties (11,131.5) (8,739.9)
Net capitalized costs 8,209.3 9,933.5
U.S.    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 646.0 1,116.6
Proved oil and natural gas properties 14,011.4 13,292.6
Gross capitalized costs 14,657.4 14,409.2
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (105.0) (136.4)
Proved oil and natural gas properties (8,166.5) (6,298.9)
Net capitalized costs 6,385.9 7,973.9
Canada    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 22.2 243.7
Proved oil and natural gas properties 4,619.4 4,176.7
Gross capitalized costs 4,641.6 4,420.4
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties 0.0 (225.4)
Proved oil and natural gas properties (2,944.3) (2,438.6)
Net capitalized costs 1,697.3 1,756.4
Other    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 137.5 210.4
Proved oil and natural gas properties 23.8 21.1
Gross capitalized costs 161.3 231.5
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (14.5) (25.9)
Proved oil and natural gas properties (20.7) (2.4)
Net capitalized costs $ 126.1 $ 203.2