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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 | Dec. 31, 2019 USD ($) DTH gal kWh | Dec. 31, 2019 EUR (€) DTH gal kWh | Sep. 30, 2019 USD ($) DTH gal kWh | Sep. 30, 2019 EUR (€) DTH gal kWh | Dec. 31, 2018 USD ($) DTH gal kWh | Dec. 31, 2018 EUR (€) DTH gal kWh
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 772.0 | 772.0 | 800.4 | 800.4 | 450.4 | 450.4
Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 4,145.1 | 4,145.1 | 3,098.1 | 3,098.1 | 3,974.7 | 3,974.7
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 555.8 | 555.8 | 366.7 | 366.7 | 366.7 | 366.7
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 201.4 | 201.4 | 196.1 | 196.1 | 188.0 | 188.0
Natural gas basis swap contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 154.7 | 154.7 | 131.1 | 131.1 | 81.2 | 81.2
NYMEX natural gas storage futures contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 0.4 | 0.4 | 0.3 | 0.3 | 0.7 | 0.7
NYMEX natural gas option contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 2.0 | 2.0 | 2.4 | 2.4 | 0.0 | 0.0
NYMEX propane storage futures contracts (in gallons) | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 0.1 | 0.1 | 0.5 | 0.5 | 0.3 | 0.3
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 1,354.0 | € 300.0 | $ 1,357.3 | € 300.0 | $ 114.1 | € 300.0
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 431.2 | € 172.8 | $ 516.0 | € 172.8 | $ 408.6 | € 172.8
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 14.5 | 14.5 | 23.3 | 23.3 | 14.7 | 14.7

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