Annual report pursuant to Section 13 and 15(d)

Note 20 - Supplemental Oil and Gas Disclosures - Standardized Measure of Discounted Future Net Cash Flows (Details)

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Note 20 - Supplemental Oil and Gas Disclosures - Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Standardized Measure of Discounted Future Net Cash Flows        
Future cash inflows $ 4,153.8 $ 3,500.9 $ 2,328.8  
Production (1,901.1) (958.5) (813.8)  
Development (297.3) (272.4) (157.4)  
Dismantlement and abandonment (497.4) (355.9) (361.9)  
Income taxes [1] (170.5) (293.9) (74.8)  
Future net cash inflows before 10% discount 1,287.5 1,620.2 920.9  
10% annual discount factor (300.6) (553.2) (180.3)  
Total $ 986.9 $ 1,067.0 $ 740.6 $ 478.3
[1] No future income taxes were estimated for 2016 as our tax position had sufficient tax basis to offset estimated future taxes. State income taxes were disregarded due to immateriality.