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Supplemental Oil and Gas Information - Capitalized Costs Relating to Oil and Gas Producing Activities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties $ 1,570.7 $ 821.1
Proved oil and natural gas properties 17,490.4 15,371.3
Gross capitalized costs 19,061.1 16,192.4
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (387.7) (368.2)
Proved oil and natural gas properties (8,739.9) (7,522.5)
Net capitalized costs 9,933.5 8,301.7
United States    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 1,116.6 394.2
Proved oil and natural gas properties 13,292.6 11,678.3
Gross capitalized costs 14,409.2 12,072.5
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (136.4) (129.3)
Proved oil and natural gas properties (6,298.9) (5,433.7)
Net capitalized costs 7,973.9 6,509.5
Canada    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 243.7 250.0
Proved oil and natural gas properties 4,176.7 3,693.0
Gross capitalized costs 4,420.4 3,943.0
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (225.4) (213.5)
Proved oil and natural gas properties (2,438.6) (2,088.8)
Net capitalized costs 1,756.4 1,640.7
Other    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and natural gas properties 210.4 176.9
Proved oil and natural gas properties 21.1 0.0
Gross capitalized costs 231.5 176.9
Accumulated depreciation, depletion and amortization    
Unproved oil and natural gas properties (25.9) (25.4)
Proved oil and natural gas properties (2.4) 0.0
Net capitalized costs $ 203.2 $ 151.5