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Disclosures About Derivative Instruments and Hedging Activities - Narrative (Details) In Millions, unless otherwise specified | 6 Months Ended |  |  |  |  |  |  |  |  |  |  | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2014 USD ($) | Sep. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2014 LPG (millions of gallons) gal | Mar. 31, 2013 LPG (millions of gallons) gal | Mar. 31, 2014 Brokerage Accounts USD ($) | Mar. 31, 2013 Brokerage Accounts USD ($) | Mar. 31, 2014 Interest Rate Swaps EUR (€) | Mar. 31, 2013 Interest Rate Swaps EUR (€) | Mar. 31, 2014 Interest Rate Protection Agreements USD ($) | Mar. 31, 2013 Interest Rate Protection Agreements USD ($) | Mar. 31, 2014 Foreign Currency USD ($) | Mar. 31, 2013 Foreign Currency USD ($) | Mar. 31, 2014 Cross Currency Interest Rate Contract USD ($) | Mar. 31, 2014 Gas Utility DTH | Mar. 31, 2013 Gas Utility DTH | Mar. 31, 2014 Electric Utility USD ($) kWh | Mar. 31, 2013 Electric Utility USD ($) kWh | Mar. 31, 2014 Midstream & Marketing Electric transmission congestion - Electric Utility kWh | Mar. 31, 2013 Midstream & Marketing Electric transmission congestion - Electric Utility kWh | Mar. 31, 2014 Midstream & Marketing Electric transmission congestion (excluding Electric Utility) kWh | Mar. 31, 2013 Midstream & Marketing Electric transmission congestion (excluding Electric Utility) kWh | Mar. 31, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Mar. 31, 2013 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Purchase Contracts kWh | Mar. 31, 2014 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Mar. 31, 2013 Midstream & Marketing Electricity (millions of kilowatt-hours) Forward Sales Contracts kWh | Mar. 31, 2014 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Mar. 31, 2013 Midstream & Marketing Propane Storage (millions of dekatherms) Forward Sales Contracts gal | Mar. 31, 2014 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts DTH | Mar. 31, 2013 Midstream & Marketing Gas Utility Natural Gas Forward Purchase Contracts DTH | Mar. 31, 2014 Midstream & Marketing Natural Gas Storage Forward Sales Contracts DTH | Mar. 31, 2013 Midstream & Marketing Natural Gas Storage Forward Sales Contracts DTH
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding derivative commodity instruments volumes |  |  |  | 121,900,000 | 129,400,000 |  |  |  |  |  |  |  |  |  | 9,000,000 | 10,000,000 | 207,000,000 | 403,200,000 | 47,400,000 | 47,500,000 | 435,100,000 | 261,000,000 | 603,100,000 | 1,034,400,000 | 346,100,000 | 449,900,000 | 0 | 0 | 69,900,000 | 17,300,000 | 100,000 | 400,000
Maximum length of time hedged in price risk cash flow hedges (in months) |  |  |  | 23 months |  |  |  |  |  |  |  | 36 months |  |  | 11 months |  | 8 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 65.3 | $ 57.5 | $ 87.1 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.4) | $ 5.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum approximate range of estimated dollar-denominated purchases of LPG (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Length if Time Hedged (in months) |  |  |  | 7 months |  |  |  |  |  |  |  | 17 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | 439.8 | 441.2 | 0 | 173.0 | 199.4 | 92.7 | 52.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum approximate range of estimated dollar-denominated purchases of LPG (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses associated with commodity price risk hedges expected to be reclassified into earnings during the next twelve months | 12.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 4.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 4.4 | 8.3 | 2.8 |  |  | 4.4 | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- 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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