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Derivative Instruments and Hedging Activities (Details) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |
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Sep. 30, 2014 gal | Sep. 30, 2013 gal | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2014 Interest Rate Swaps [Member] EUR (€) | Sep. 30, 2013 Interest Rate Swaps [Member] EUR (€) | Sep. 30, 2014 Foreign Currency [Member] USD ($) | Sep. 30, 2013 Foreign Currency [Member] USD ($) | Sep. 30, 2012 Interest Rate Protection Agreements [Member] USD ($) | Sep. 30, 2014 Interest Rate Protection Agreements [Member] USD ($) | Sep. 30, 2013 Interest Rate Protection Agreements [Member] USD ($) | Sep. 30, 2014 Net Investment Hedges EUR (€) | Sep. 30, 2013 Net Investment Hedges EUR (€) | Sep. 30, 2014 Electric transmission congestion - Electric Utility [Member] kWh | Sep. 30, 2013 Electric transmission congestion - Electric Utility [Member] kWh | Sep. 30, 2014 LPG [Member] | Sep. 30, 2014 Natural Gas [Member] DTH | Sep. 30, 2013 Natural Gas [Member] DTH | Sep. 30, 2014 Electricity (millions of kilowatt-hours) [Member] Call Option [Member] kWh | Sep. 30, 2013 Electricity (millions of kilowatt-hours) [Member] Call Option [Member] kWh | Sep. 30, 2014 Electricity (millions of kilowatt-hours) [Member] Put Option [Member] kWh | Sep. 30, 2013 Electricity (millions of kilowatt-hours) [Member] Put Option [Member] kWh | Sep. 30, 2014 Brokerage Accounts [Member] USD ($) | Sep. 30, 2013 Brokerage Accounts [Member] USD ($) | Sep. 30, 2014 Gas Utility DTH | Sep. 30, 2013 Gas Utility DTH | Sep. 30, 2014 Electric Utility - Forward Contract [Member] kWh | Sep. 30, 2013 Electric Utility - Forward Contract [Member] kWh | Sep. 30, 2014 Midstream And Marketing Natural Gas [Member] DTH | Sep. 30, 2013 Midstream And Marketing Natural Gas [Member] DTH | Sep. 30, 2014 Midstream And Marketing Propane Storage [Member] gal | Sep. 30, 2013 Midstream And Marketing Propane Storage [Member] gal | Sep. 30, 2014 Minimum Foreign Currency [Member] | Sep. 30, 2014 Maximum Foreign Currency [Member] | Sep. 30, 2014 Flaga Term Loan, due September 2016 [Member] Flaga [Member] Notes Payable to Banks USD ($) | Sep. 30, 2013 Flaga Term Loan, due September 2016 [Member] Flaga [Member] Notes Payable to Banks USD ($) | Sep. 30, 2013 Flaga Term Loan, due September 2016 [Member] Flaga [Member] Notes Payable to Banks Cross Currency Contracts USD ($)
Derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Volume | 344,500,000 | 279,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge |  |  | 21 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 232,100,000 | 189,300,000 |  | 113,700,000 | 24,300,000 | 394,400,000 | 754,400,000 | 206,600,000 | 393,000,000 |  |  | 16,900,000 | 15,000,000 | 237,000,000 | 245,800,000 | 3,900,000 | 2,900,000 | 1,300,000 | 2,800,000 |  |  |  |  |
Maximum length of time hedged in price risk cash flow hedges |  |  |  |  |  |  |  | 27 months |  |  |  |  |  |  |  |  | 41 months |  |  | 24 months |  | 12 months |  |  |  | 12 months |  | 8 months |  |  |  |  |  |  |  |  |  |
Fair values of electric utility's forward purchase power agreements |  |  | $ (75.2) | $ (57.5) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses associated with commodity price risk hedges expected to be reclassified into earnings during the next twelve months |  |  | (2.3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underlying variable rate debt |  |  |  |  |  | 401.1 | 440.5 | 219.8 | 200.2 |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded loss amount included in Other Income, Net |  |  |  |  |  |  |  |  |  | 0.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 dollar-denominated purchases of LPG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |
Maximum approximate range of estimated dollar-denominated purchases of LPG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |
Amount of net losses associated with currency rate risk to be reclassified into earnings during the next 12 months |  |  | 4.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 3,510.8 | 3,609.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.0 | 52.0 | 52.0
Restricted Cash in brokerage accounts |  |  | $ 16.6 | $ 8.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.6 | $ 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Certain immaterial amounts have been revised to correct the classification of derivatives.

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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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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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