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Disclosures About Derivative Instruments and Hedging Activities (Details Textual) In Millions, unless otherwise specified |  |  |  | 6 Months Ended |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2013 USD ($) | Sep. 30, 2012 USD ($) | Mar. 31, 2012 USD ($) | Mar. 31, 2013 Foreign Currency [Member] USD ($) | Mar. 31, 2012 Foreign Currency [Member] USD ($) | Mar. 31, 2013 Interest Rate Swaps [Member] EUR (€) | Mar. 31, 2012 Interest Rate Swaps [Member] EUR (€) | Mar. 31, 2012 Interest Rate Protection Agreements [Member] USD ($) | Mar. 31, 2013 Interest Rate Protection Agreements [Member] USD ($) | Mar. 31, 2012 Net Investment Hedges [Member] EUR (€) | Mar. 31, 2013 LPG (millions of gallons) [Member] | Mar. 31, 2013 Natural Gas (millions of dekatherms) [Member] | Mar. 31, 2013 Electricity (millions of kilowatt-hours) [Member] Forward Purchase Contracts [Member] | Mar. 31, 2013 Electricity (millions of kilowatt-hours) [Member] Forward Sales Contracts [Member] | Mar. 31, 2013 Electric transmission congestion - Electric Utility [Member] kWh | Mar. 31, 2012 Electric transmission congestion - Electric Utility [Member] kWh | Mar. 31, 2013 Gas Utility [Member] DTH | Mar. 31, 2012 Gas Utility [Member] DTH | Mar. 31, 2013 Midstream & Marketing [Member] Electric transmission congestion (excluding Electric Utility) [Member] kWh | Mar. 31, 2012 Midstream & Marketing [Member] Electric transmission congestion (excluding Electric Utility) [Member] kWh | Mar. 31, 2013 Electric Utility - Forward Contract [Member] USD ($) kWh | Mar. 31, 2012 Electric Utility - Forward Contract [Member] USD ($) kWh | Mar. 31, 2013 Midstream and Marketing Natural Gas [Member] DTH | Mar. 31, 2012 Midstream and Marketing Natural Gas [Member] DTH | Mar. 31, 2013 Midstream and Marketing Propane Storage [Member] gal | Mar. 31, 2012 Midstream and Marketing Propane Storage [Member] gal
Disclosures About Derivative Instruments Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,500,000 | 52,200,000 | 10,000,000 | 11,600,000 | 261,000,000 | 355,800,000 | 403,200,000 | 707,400,000 | 400,000 | 4,600,000 | 0 | 1,200,000
Maximum length of time hedged in price risk cash flow hedges (in months) |  |  |  | 24 months |  |  |  |  |  |  | 20 months | 43 months | 30 months | 11 months |  |  | 12 months |  | 2 months |  | 14 months |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 76.3 |  | $ 136.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.5 | $ 14.7 |  |  |  |
Underlying variable rate debt |  |  |  | 92.7 | 63.9 | 441.2 | 442.6 | 173.0 | 173.0 | 14.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Length if Time Hedged (in months) |  |  |  | 13 months |  |  |  |  |  |  | 7 months | 11 months | 9 months | 5 months |  |  |  |  |  |  |  |  |  |  |  |
Recorded loss amount included in Other Income, Net |  |  |  |  |  |  |  | 0.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 5.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net losses associated with interest rate hedges to be reclassified with interest rate hedges during the next 12 months | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of net gains associated with currency rate risk to be reclassified into earnings during the next 12 months | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash in brokerage accounts | $ 2.8 | $ 3.0 | $ 16.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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