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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 | Dec. 31, 2017 EUR (€) gal MMBTU kWh | Dec. 31, 2017 USD ($) gal MMBTU kWh | Sep. 30, 2017 EUR (€) gal MMBTU kWh | Sep. 30, 2017 USD ($) gal MMBTU kWh | Dec. 31, 2016 EUR (€) gal MMBTU kWh | Dec. 31, 2016 USD ($) gal MMBTU kWh
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Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 4,733.9 | 4,733.9 | 4,440.3 | 4,440.3 | 685.5 | 685.5
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 325.2 | 325.2 | 447.0 | 447.0 | 352.5 | 352.5
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 275.4 | 275.4 | 325.5 | 325.5 | 325.9 | 325.9
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 128.3 | 128.3 | 75.9 | 75.9 | 70.2 | 70.2
Natural gas basis swap contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 90.2 | 90.2 | 104.2 | 104.2 | 120.1 | 120.1
NYMEX natural gas storage (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 1.3 | 1.3 | 1.9 | 1.9 | 1.3 | 1.3
NYMEX propane storage (in gallons) | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 0.1 | 0.1 | 0.3 | 0.3 | 0.0 | 0.0
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € | € 645.8 |  | € 645.8 |  | € 645.8 |
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ |  | $ 485.7 |  | $ 424.8 |  | $ 416.7
Cross-currency contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ |  | $ 49.9 |  | $ 59.1 |  | $ 59.1
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 13.4 | 13.4 | 14.8 | 14.8 | 11.7 | 11.7
Regulated Utility Operations | FTRs (in kilowatts) | Electricity |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 63.1 | 63.1 | 101.2 | 101.2 | 36.2 | 36.2

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