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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 7 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2014
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |
Purchase of reserves in place | $ 300.6 | $ 0
Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves | (20.8) | (44.6)
Net change | 302.3 | 43.5
Compass |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |
Sales and transfers of oil and natural gas produced | (46.2) | 77.4
Net changes in prices and production costs | 39.2 | 141.8
Extensions and discoveries, net of future development and production costs | 8.1 | 3.5
Development costs during the period | 7.4 | (10.0)
Changes in estimated future development costs | 20.2 | (12.0)
Revisions of previous quantity estimates | (50.2) | 24.2
Accretion of discount before income taxes | 16.1 | 32.3
Changes in timing and other | $ 27.9 | $ (34.3)

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 + Details
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- Definition Amount of increase in standardized measure of discounted future net cash flow as a result of purchases of minerals in place. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447 + Details
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