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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) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Compass
   
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]    
Future cash inflows $ 1,895.2 $ 1,638.5
Future production costs 914.9 923.7
Future development costs 164.4 156.0
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense 136.2 39.3
Future net cash flows 679.7 519.5
Discount of future net cash flows at 10% per annum 333.9 217.2
Standardized measure of discounted future net cash flows $ 345.8 $ 302.3
Oil
   
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]    
Reference Price 99.08 95.04
Natural Gas
   
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]    
Reference Price 4.24 3.60
Natural Gas Liquids
   
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]    
Reference Price 43.58 38.64