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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, 2013 USD ($) | Sep. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2013 Foreign Currency [Member] USD ($) | Dec. 31, 2012 Foreign Currency [Member] USD ($) | Dec. 31, 2013 Interest Rate Swaps [Member] EUR (€) | Dec. 31, 2012 Interest Rate Swaps [Member] EUR (€) | Dec. 31, 2013 Interest Rate Protection Agreements [Member] USD ($) | Dec. 31, 2012 Interest Rate Protection Agreements [Member] USD ($) | Dec. 31, 2013 Cross Currency Interest Rate Contract [Member] USD ($) | Dec. 31, 2013 LPG (millions of gallons) [Member] | Dec. 31, 2013 Electricity (millions of kilowatt-hours) [Member] Forward Purchase Contracts [Member] kWh | Dec. 31, 2012 Electricity (millions of kilowatt-hours) [Member] Forward Purchase Contracts [Member] kWh | Dec. 31, 2013 Electricity (millions of kilowatt-hours) [Member] Forward Sales Contracts [Member] kWh | Dec. 31, 2012 Electricity (millions of kilowatt-hours) [Member] Forward Sales Contracts [Member] kWh | Dec. 31, 2013 Electric transmission congestion - Electric Utility [Member] kWh | Dec. 31, 2012 Electric transmission congestion - Electric Utility [Member] kWh | Dec. 31, 2013 Brokerage Accounts [Member] USD ($) | Dec. 31, 2012 Brokerage Accounts [Member] USD ($) | Dec. 31, 2013 Gas Utility [Member] DTH | Dec. 31, 2012 Gas Utility [Member] DTH | Dec. 31, 2013 Midstream & Marketing [Member] Natural Gas (millions of dekatherms) [Member] DTH | Dec. 31, 2012 Midstream & Marketing [Member] Natural Gas (millions of dekatherms) [Member] DTH | Dec. 31, 2013 Midstream & Marketing [Member] Electric transmission congestion (excluding Electric Utility) [Member] kWh | Dec. 31, 2012 Midstream & Marketing [Member] Electric transmission congestion (excluding Electric Utility) [Member] kWh | Dec. 31, 2013 Electric Utility - Forward Contract [Member] USD ($) kWh | Dec. 31, 2012 Electric Utility - Forward Contract [Member] USD ($) kWh | Dec. 31, 2013 Midstream and Marketing Natural Gas [Member] DTH | Dec. 31, 2012 Midstream and Marketing Natural Gas [Member] DTH | Dec. 31, 2013 Midstream and Marketing Propane Storage [Member] gal | Dec. 31, 2012 Midstream and Marketing Propane Storage [Member] gal | Dec. 31, 2013 Designated as Hedging Instrument [Member] LPG (millions of gallons) [Member] gal | Dec. 31, 2012 Designated as Hedging Instrument [Member] LPG (millions of gallons) [Member] gal
Disclosures About Derivative Instruments Hedging Activities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount (in units) |  |  |  |  |  |  |  |  |  |  |  | 664,700,000 | 1,180,800,000 | 371,000,000 | 195,300,000 | 117,900,000 | 118,200,000 |  |  | 9,700,000 | 13,000,000 | 27,400,000 | 21,100,000 | 968,000,000 | 677,500,000 | 324,400,000 | 482,300,000 | 1,100,000 | 2,400,000 | 2,200,000 | 2,000,000 | 215,200,000 | 212,100,000
Maximum length of time hedged in price risk cash flow hedges (in months) |  |  |  | 27 months |  |  |  |  |  |  | 21 months |  |  |  |  |  |  |  |  | 9 months |  |  |  |  |  | 11 months |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 49.2 | $ 57.5 | $ 128.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.2 | $ 8.2 |  |  |  |  |  |
Notional amount |  |  |  | 149.1 | 120.0 | 439.8 | 441.2 | 0 | 173.0 | 52.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Length if Time Hedged (in months) |  |  |  | 12 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 | 43.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 3.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 4.5 | $ 8.3 | $ 6.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.2 | $ 6.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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