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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure (Details)
$ in Millions
Sep. 30, 2015
USD ($)
$ / MMBTU
$ / bbl
Sep. 30, 2014
USD ($)
$ / MMBTU
$ / bbl
Sep. 30, 2013
USD ($)
$ / MMBTU
$ / bbl
Compass      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash inflows $ 1,330.1 $ 1,895.2 $ 1,638.5
Future production costs 750.8 914.9 923.7
Future development costs 160.0 164.4 156.0
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense 0.0 136.2 39.3
Future net cash flows 419.3 679.7 519.5
Discount of future net cash flows at 10% per annum 191.2 333.9 217.2
Standardized measure of discounted future net cash flows $ 228.1 $ 345.8 $ 302.3
Oil      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Reference Price | $ / bbl 59.21 99.08 95.04
Natural Gas      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Reference Price | $ / MMBTU 3.06 4.24 3.60
Natural Gas Liquids      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Reference Price | $ / bbl 21.50 43.58 38.64