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Supplemental Oil and Gas Information (Capitalized Costs Relating to Oil and Gas Producing Activities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and gas properties $ 842.3 $ 830.3
Proved oil and gas properties 21,634.8 19,349.5
Gross capitalized costs 22,477.1 20,179.8
Accumulated depreciation, depletion and amortization    
Unproved oil and gas properties (368.2) (402.0)
Proved oil and gas properties (12,486.0) (11,696.2)
Net capitalized costs 9,622.9 8,081.6
United States [Member]    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and gas properties 394.2 360.9
Proved oil and gas properties 11,678.3 9,606.4
Gross capitalized costs 12,072.5 9,967.3
Accumulated depreciation, depletion and amortization    
Unproved oil and gas properties (129.3) (149.5)
Proved oil and gas properties (5,433.7) (4,893.8)
Net capitalized costs 6,509.5 4,924.0
Canada [Member]    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and gas properties 250.0 286.8
Proved oil and gas properties 3,693.0 3,603.4
Gross capitalized costs 3,943.0 3,890.2
Accumulated depreciation, depletion and amortization    
Unproved oil and gas properties (213.5) (230.7)
Proved oil and gas properties (2,088.8) (2,027.9)
Net capitalized costs 1,640.7 1,631.6
Malaysia [Member]    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and gas properties 21.2 20.5
Proved oil and gas properties 6,263.5 6,139.7
Gross capitalized costs 6,284.7 6,160.2
Accumulated depreciation, depletion and amortization    
Proved oil and gas properties (4,963.5) (4,774.5)
Net capitalized costs 1,321.2 1,385.7
Other Regions [Member]    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Unproved oil and gas properties 176.9 162.1
Gross capitalized costs 176.9 162.1
Accumulated depreciation, depletion and amortization    
Unproved oil and gas properties (25.4) (21.8)
Net capitalized costs $ 151.5 $ 140.3