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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, 2016 EUR (€) gal MMBTU kWh | Dec. 31, 2016 USD ($) gal MMBTU kWh | Sep. 30, 2016 EUR (€) gal MMBTU kWh | Sep. 30, 2016 USD ($) gal MMBTU kWh | Dec. 31, 2015 EUR (€) gal MMBTU kWh | Dec. 31, 2015 USD ($) gal MMBTU kWh
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Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 685.5 | 685.5 | 761.2 | 761.2 | 547.8 | 547.8
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 352.5 | 352.5 | 264.6 | 264.6 | 252.9 | 252.9
Commodity contracts | Propane |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | gal | 325.9 | 325.9 | 396.9 | 396.9 | 481.9 | 481.9
Natural gas futures, forward and pipeline contracts | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 70.2 | 70.2 | 71.1 | 71.1 | 104.9 | 104.9
Natural gas basis swap contracts | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 120.1 | 120.1 | 118.3 | 118.3 | 86.1 | 86.1
NYMEX natural gas and propane storage | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 1.3 | 1.3 | 1.9 | 1.9 | 1.6 | 1.6
NYMEX natural gas and propane storage | Propane |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | gal | 0.0 | 0.0 | 0.0 | 0.0 | 1.8 | 1.8
FTRs | Electricity |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 0.0 | 0.0 | 0.0 | 0.0 | 51.1 | 51.1
Interest rate swaps |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | € | € 645.8 |  | € 645.8 |  | € 645.8 |
IRPAs |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | $ |  | $ 0.0 |  | $ 0.0 |  | $ 290.0
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | $ |  | 416.7 |  | 314.3 |  | 280.5
Cross-currency swaps |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | $ |  | $ 59.1 |  | $ 59.1 |  | $ 59.1
Regulated Utility Operations | Commodity contracts | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 11.7 | 11.7 | 18.4 | 18.4 | 12.4 | 12.4
Regulated Utility Operations | Commodity contracts | Electricity |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 0.0 | 0.0 | 0.0 | 0.0 | 55.9 | 55.9
Regulated Utility Operations | FTRs | Electricity |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 36.2 | 36.2 | 58.3 | 58.3 | 172.6 | 172.6

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