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Disclosures About Derivative Instruments and Hedging Activities - Narrative (Details) In Millions, unless otherwise specified | 9 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  |  |  | 0 Months Ended | 9 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2013 USD ($) | Jun. 30, 2014 LPG (millions of gallons) | Jun. 30, 2014 LPG (millions of gallons) gal | Jun. 30, 2013 LPG (millions of gallons) gal | Jun. 30, 2014 Brokerage Accounts USD ($) | Jun. 30, 2013 Brokerage Accounts USD ($) | Jun. 30, 2014 Interest Rate Swaps EUR (€) | Jun. 30, 2013 Interest Rate Swaps EUR (€) | Jun. 30, 2014 Interest Rate Protection Agreements USD ($) | Jun. 30, 2013 Interest Rate Protection Agreements USD ($) | Jun. 30, 2014 Foreign Currency | Jun. 30, 2014 Foreign Currency USD ($) | Jun. 30, 2013 Foreign Currency USD ($) | Jun. 30, 2014 Cross Currency Interest Rate Contract USD ($) | Jun. 30, 2014 Gas Utility | Jun. 30, 2014 Gas Utility DTH | Jun. 30, 2013 Gas Utility DTH | Jun. 30, 2014 Electric Utility | Jun. 30, 2014 Electric Utility USD ($) kWh | Jun. 30, 2013 Electric Utility USD ($) kWh | Jun. 30, 2014 Midstream & Marketing Electric transmission congestion - Electric Utility kWh | Jun. 30, 2013 Midstream & Marketing Electric transmission congestion - Electric Utility kWh | Jun. 30, 2014 Midstream & Marketing Electric transmission congestion (excluding Electric Utility) kWh | Jun. 30, 2013 Midstream & Marketing Electric transmission congestion (excluding Electric Utility) kWh | Jun. 30, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Jun. 30, 2013 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Jun. 30, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Jun. 30, 2013 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Jun. 30, 2014 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Jun. 30, 2013 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Jun. 30, 2014 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts DTH | Jun. 30, 2013 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts DTH | Jun. 30, 2014 Midstream & Marketing Natural Gas Storage Forward Sales Contracts DTH | Jun. 30, 2013 Midstream & Marketing Natural Gas Storage Forward Sales Contracts DTH
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  |  | 274,300,000 | 236,700,000 |  |  |  |  |  |  |  |  |  |  |  | 10,900,000 | 11,700,000 |  | 315,800,000 | 327,400,000 | 232,200,000 | 260,600,000 | 427,700,000 | 1,609,200,000 | 492,500,000 | 927,200,000 | 193,200,000 | 451,000,000 | 2,900,000 | 1,800,000 | 83,000,000 | 19,400,000 | 500,000 | 2,700,000
Maximum Length of Time Hedged in Price Risk Cash Flow Hedges |  |  |  | 21 months |  |  |  |  |  |  |  |  | 33 months |  |  |  | 9 months |  |  | 11 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 61.3 | $ 57.5 | $ 87.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.8 | $ (6.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Length of Time Hedged in Price Risk Cash Flow Hedge |  |  |  | 6 months |  |  |  |  |  |  |  |  | 15 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses associated with commodity price risk hedges expected to be reclassified into earnings during the next twelve months | 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | 401.1 | 440.5 | 0 | 173.0 |  | 219.8 | 170.3 | 52.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Approximate Range of Estimated Purchases of Product |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum approximate range of estimated dollar-denominated purchases of LPG (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 3.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 5.9 | 8.3 | 6.0 |  |  |  | 5.9 | 6.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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