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Disclosures About Derivative Instruments and Hedging Activities (Details Textual) In Millions, unless otherwise specified |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 USD ($) | Sep. 30, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2012 Foreign Currency [Member] USD ($) | Jun. 30, 2011 Foreign Currency [Member] USD ($) | Dec. 31, 2012 Interest Rate Swaps [Member] EUR (€) | Dec. 31, 2011 Interest Rate Swaps [Member] EUR (€) | Dec. 31, 2012 Interest Rate Protection Agreements [Member] USD ($) | Dec. 31, 2011 Interest Rate Protection Agreements [Member] USD ($) | Dec. 31, 2011 Net Investment Hedges [Member] EUR (€) | Dec. 31, 2012 LPG (millions of gallons) [Member] | Dec. 31, 2012 Natural Gas (millions of dekatherms) [Member] | Dec. 31, 2012 Electricity (millions of kilowatt-hours) [Member] Forward Purchase Contracts [Member] | Dec. 31, 2012 Electricity (millions of kilowatt-hours) [Member] Forward Sales Contracts [Member] | Dec. 31, 2012 Electric transmission congestion - Electric Utility [Member] kWh | Dec. 31, 2011 Electric transmission congestion - Electric Utility [Member] kWh | Dec. 31, 2012 Gas Utility [Member] DTH | Dec. 31, 2011 Gas Utility [Member] DTH | Dec. 31, 2012 Midstream & Marketing [Member] Electric transmission congestion (excluding Electric Utility) [Member] kWh | Dec. 31, 2011 Midstream & Marketing [Member] Electric transmission congestion (excluding Electric Utility) [Member] kWh | Dec. 31, 2012 Electric Utility - Forward Contract [Member] USD ($) kWh | Dec. 31, 2011 Electric Utility - Forward Contract [Member] USD ($) kWh | Dec. 31, 2012 Midstream and Marketing Natural Gas [Member] DTH | Dec. 31, 2011 Midstream and Marketing Natural Gas [Member] DTH | Dec. 31, 2012 Midstream and Marketing Propane Storage [Member] gal | Dec. 31, 2011 Midstream and Marketing Propane Storage [Member] gal
Disclosures About Derivative Instruments Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,200,000 | 130,000,000 | 13,000,000 | 9,100,000 | 677,500,000 | 882,100,000 | 482,300,000 | 816,000,000 | 2,400,000 | 3,900,000 | 2,000,000 | 3,500,000
Maximum length of time hedged in price risk cash flow hedges (in months) |  |  |  | 27 months |  |  |  |  |  |  | 23 months | 41 months | 33 months | 12 months |  |  | 9 months |  | 5 months |  | 17 months |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 121.1 |  | $ 130.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.2 | $ 13.5 |  |  |  |
Underlying variable rate debt |  |  |  | 120.0 | 106.0 | 441.2 | 442.6 | 173.0 | 173.0 | 14.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Length if Time Hedged (in months) |  |  |  | 12 months |  |  |  |  |  |  | 5 months | 12 months | 9 months | 5 months |  |  |  |  |  |  |  |  |  |  |  |
Minimum approximate range of estimated dollar-denominated purchases of LPG (as a percent) |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum approximate range of estimated dollar-denominated purchases of LPG (as a percent) |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures About Derivative Instruments Hedging Activities (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses associated with commodity price risk hedges expected to be reclassified into earnings during the next twelve months | 42.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash in brokerage accounts | $ 6.9 | $ 3.0 | $ 22.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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