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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, 2019 USD ($) DTH kWh gal | Sep. 30, 2019 EUR (€) DTH kWh gal | Sep. 30, 2018 USD ($) DTH kWh gal | Sep. 30, 2018 EUR (€) DTH kWh gal
--- | --- | --- | --- | ---
Commodity contracts | Propane |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | gal | 800.4 | 800.4 | 394.3 | 394.3
Commodity contracts | Electricity | Long |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 3,098.1 | 3,098.1 | 4,307.6 | 4,307.6
Commodity contracts | Electricity | Short |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | kWh | 366.7 | 366.7 | 359.3 | 359.3
Natural gas futures, forward and pipeline contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 196.1 | 196.1 | 159.7 | 159.7
Natural gas basis swap contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 131.1 | 131.1 | 54.4 | 54.4
NYMEX natural gas storage futures contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 0.3 | 0.3 | 1.8 | 1.8
NYMEX natural gas option contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 2.4 | 2.4 | 0.0 | 0.0
NYMEX propane storage futures contracts | Propane |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | gal | 0.5 | 0.5 | 0.6 | 0.6
Interest rate swaps |  |  |  |
Derivative |  |  |  |
Notional amount | $ 1,357.3 | € 300.0 | $ 114.1 | € 585.8
Forward foreign exchange contracts |  |  |  |
Derivative |  |  |  |
Notional amount | $ | 516.0 |  | 512.2 |
Cross-currency swaps |  |  |  |
Derivative |  |  |  |
Notional amount | $ | $ 0.0 |  | $ 49.9 |
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |
Derivative |  |  |  |
Notional amount (in units) | 23.3 | 23.3 | 23.2 | 23.2
Net Investment Hedging | Forward foreign exchange contracts |  |  |  |
Derivative |  |  |  |
Notional amount | $ 0.0 | € 172.8 |  | € 0.0

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