Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Unaudited - Capitalized Costs Related to Oil and Natural Gas (Details)

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Supplemental Oil and Gas Disclosures - Unaudited - Capitalized Costs Related to Oil and Natural Gas (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Note 19 - Supplemental Oil and Gas Disclosures - Unaudited - Capitalized Costs Related to Oil and Natural Gas (Details)      
Proved oil and natural gas properties and equipment $ 8,636.4 $ 8,567.5 $ 8,532.2
Accumulated depreciation, depletion and amortization related to oil, NGLs and natural gas activities (7,981.3) (7,890.9) (7,793.3)
Net capitalized costs related to producing activities $ 655.1 $ 676.6 $ 738.9