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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, 2018 EUR (€) DTH kWh gal | Dec. 31, 2018 USD ($) DTH kWh gal | Sep. 30, 2018 EUR (€) DTH kWh gal | Sep. 30, 2018 USD ($) DTH kWh gal | Dec. 31, 2017 EUR (€) DTH kWh gal | Dec. 31, 2017 USD ($) DTH kWh gal
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Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 3,974.7 | 3,974.7 | 4,307.6 | 4,307.6 | 4,733.9 | 4,733.9
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 366.7 | 366.7 | 359.3 | 359.3 | 325.2 | 325.2
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 450.4 | 450.4 | 394.3 | 394.3 | 275.4 | 275.4
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 188.0 | 188.0 | 159.7 | 159.7 | 128.3 | 128.3
Natural gas basis swap contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 81.2 | 81.2 | 54.4 | 54.4 | 90.2 | 90.2
NYMEX natural gas storage (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 0.7 | 0.7 | 1.8 | 1.8 | 1.3 | 1.3
NYMEX propane storage (in gallons) | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 0.3 | 0.3 | 0.6 | 0.6 | 0.1 | 0.1
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € 300.0 | $ 114.1 | € 585.8 | $ 114.1 | € 645.8 | $ 0.0
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € 172.8 | 408.6 | € 0.0 | 512.2 | € 0.0 | 485.7
Cross-currency contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ |  | $ 0.0 |  | $ 49.9 |  | $ 49.9
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 14.7 | 14.7 | 23.2 | 23.2 | 13.4 | 13.4
Regulated Utility Operations | FTRs (in kilowatts) | Electricity |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 0.0 | 0.0 | 0.0 | 0.0 | 63.1 | 63.1

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