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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts (Details) € in Millions, kWh in Millions, gal in Millions, DTH in Millions, $ in Millions | Sep. 30, 2018 EUR (€) kWh DTH gal | Sep. 30, 2018 USD ($) kWh DTH gal | Sep. 30, 2017 EUR (€) kWh DTH gal | Sep. 30, 2017 USD ($) kWh DTH gal
--- | --- | --- | --- | ---
Commodity contracts | Electricity | Long |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 4,307.6 | 4,307.6 | 4,440.3 | 4,440.3
Commodity contracts | Electricity | Short |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 359.3 | 359.3 | 447.0 | 447.0
Commodity contracts | Propane |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | gal | 394.3 | 394.3 | 325.5 | 325.5
Natural gas futures, forward and pipeline contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 159.7 | 159.7 | 75.9 | 75.9
Natural gas basis swap contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 54.4 | 54.4 | 104.2 | 104.2
NYMEX natural gas storage | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 1.8 | 1.8 | 1.9 | 1.9
NYMEX propane storage | Propane |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | gal | 0.6 | 0.6 | 0.3 | 0.3
Interest rate swaps |  |  |  |
Derivative |  |  |  |
Notional amount | € 585.8 | $ 114.1 | € 645.8 | $ 0.0
Forward foreign currency exchange contracts |  |  |  |
Derivative |  |  |  |
Notional amount | $ |  | 512.2 |  | 424.8
Cross-currency swaps |  |  |  |
Derivative |  |  |  |
Notional amount | $ |  | $ 49.9 |  | $ 59.1
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 23.2 | 23.2 | 14.8 | 14.8
Regulated Utility Operations | FTRs contracts | Electricity |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 0.0 | 0.0 | 101.2 | 101.2

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