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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 | Mar. 31, 2017 EUR (€) kWh gal MMBTU | Mar. 31, 2017 USD ($) kWh gal MMBTU | Sep. 30, 2016 EUR (€) kWh gal MMBTU | Sep. 30, 2016 USD ($) kWh gal MMBTU | Mar. 31, 2016 EUR (€) kWh gal MMBTU | Mar. 31, 2016 USD ($) kWh gal MMBTU
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 668.7 | 668.7 | 761.2 | 761.2 | 591.1 | 591.1
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 526.1 | 526.1 | 264.6 | 264.6 | 431.6 | 431.6
Commodity contracts | Propane |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | gal | 241.6 | 241.6 | 396.9 | 396.9 | 370.2 | 370.2
FTRs | Electricity |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 0.0 | 0.0 | 0.0 | 0.0 | 20.5 | 20.5
Natural gas futures, forward and pipeline contracts | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 56.5 | 56.5 | 71.1 | 71.1 | 84.7 | 84.7
Natural gas basis swap contracts | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 107.2 | 107.2 | 118.3 | 118.3 | 90.1 | 90.1
NYMEX natural gas and propane storage | Natural Gas |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | MMBTU | 1.4 | 1.4 | 1.9 | 1.9 | 1.7 | 1.7
Interest rate swaps |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | € | € 645.8 |  | € 645.8 |  | € 645.8 |
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | $ |  | $ 321.8 |  | $ 314.3 |  | $ 262.5
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 | 9.0 | 9.0 | 18.4 | 18.4 | 10.0 | 10.0
Regulated Utility Operations | Commodity contracts | Electricity |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 0.0 | 0.0 | 0.0 | 0.0 | 23.6 | 23.6
Regulated Utility Operations | FTRs | Electricity |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount (in units) | 14.6 | 14.6 | 58.3 | 58.3 | 69.2 | 69.2

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