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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, 2018 EUR (€) gal kWh MMBTU | Mar. 31, 2018 USD ($) gal kWh MMBTU | Sep. 30, 2017 EUR (€) gal kWh MMBTU | Sep. 30, 2017 USD ($) gal kWh MMBTU | Mar. 31, 2017 EUR (€) gal kWh MMBTU | Mar. 31, 2017 USD ($) gal kWh MMBTU
--- | --- | --- | --- | --- | --- | ---
Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 4,184.1 | 4,184.1 | 4,440.3 | 4,440.3 | 668.7 | 668.7
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 490.9 | 490.9 | 447.0 | 447.0 | 526.1 | 526.1
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 229.2 | 229.2 | 325.5 | 325.5 | 241.6 | 241.6
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 128.9 | 128.9 | 75.9 | 75.9 | 56.5 | 56.5
Natural gas basis swap contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 74.1 | 74.1 | 104.2 | 104.2 | 107.2 | 107.2
NYMEX natural gas storage (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 0.9 | 0.9 | 1.9 | 1.9 | 1.4 | 1.4
NYMEX propane storage (in gallons) | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 0.0 | 0.0 | 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 | $ |  | $ 496.2 |  | $ 424.8 |  | $ 321.8
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) | 12.7 | 12.7 | 14.8 | 14.8 | 9.0 | 9.0
Regulated Utility Operations | FTRs (in kilowatts) | Electricity |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 25.5 | 25.5 | 101.2 | 101.2 | 14.6 | 14.6

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