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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts (Details) € in Millions, kWh in Millions, gal in Millions, MMBTU in Millions, $ in Millions | Sep. 30, 2017 EUR (€) kWh gal MMBTU | Sep. 30, 2017 USD ($) kWh gal MMBTU | Sep. 30, 2016 EUR (€) kWh gal MMBTU | Sep. 30, 2016 USD ($) kWh gal MMBTU
--- | --- | --- | --- | ---
Commodity contracts | Electricity | Long |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 4,440.3 | 4,440.3 | 761.2 | 761.2
Commodity contracts | Electricity | Short |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 447.0 | 447.0 | 264.6 | 264.6
Commodity contracts | Propane |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | gal | 325.5 | 325.5 | 396.9 | 396.9
Natural gas futures, forward and pipeline contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 75.9 | 75.9 | 71.1 | 71.1
Natural gas basis swap contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 104.2 | 104.2 | 118.3 | 118.3
NYMEX natural gas storage | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 1.9 | 1.9 | 1.9 | 1.9
NYMEX propane storage | Propane |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | gal | 0.3 | 0.3 | 0.0 | 0.0
Interest rate swaps |  |  |  |
Derivative |  |  |  |
Notional amount | € | € 645.8 |  | € 645.8 |
Forward foreign currency exchange contracts |  |  |  |
Derivative |  |  |  |
Notional amount | $ |  | $ 424.8 |  | $ 314.3
Cross-currency swaps |  |  |  |
Derivative |  |  |  |
Notional amount | $ |  | $ 59.1 |  | $ 59.1
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 14.8 | 14.8 | 18.4 | 18.4
Regulated Utility Operations | FTRs contracts | Electricity |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 101.2 | 101.2 | 58.3 | 58.3

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