Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Supplemental Oil and Gas Disclosures - Capitalized Costs Related to Oil and Natural Gas (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net capitalized cost:      
Proved oil and natural gas properties and equipment $ 7,882.3 $ 7,924.2 $ 7,207.1
Unproved oil and natural gas properties and equipment 20.2 121.5 132.0
Accumulated depreciation, depletion and amortization related to oil, NGLs and natural gas activities [1] (6,916.2) (5,557.6) (5,069.2)
Net capitalized costs related to producing activities $ 986.3 $ 2,488.1 $ 2,269.9
[1] Includes ceiling test write-down in 2015.