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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 | Mar. 31, 2019 USD ($) DTH gal kWh | Mar. 31, 2019 EUR (€) DTH gal kWh | Sep. 30, 2018 USD ($) DTH gal kWh | Sep. 30, 2018 EUR (€) DTH gal kWh | Mar. 31, 2018 USD ($) DTH gal kWh | Mar. 31, 2018 EUR (€) DTH gal kWh
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Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 3,685.0 | 3,685.0 | 4,307.6 | 4,307.6 | 4,184.1 | 4,184.1
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 265.0 | 265.0 | 359.3 | 359.3 | 490.9 | 490.9
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 369.2 | 369.2 | 394.3 | 394.3 | 229.2 | 229.2
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 213.7 | 213.7 | 159.7 | 159.7 | 128.9 | 128.9
Natural gas basis swap contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 84.0 | 84.0 | 54.4 | 54.4 | 74.1 | 74.1
NYMEX natural gas storage (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 0.3 | 0.3 | 1.8 | 1.8 | 0.9 | 0.9
NYMEX propane storage (in gallons) | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 0.1 | 0.1 | 0.6 | 0.6 | 0.0 | 0.0
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 114.1 | € 300.0 | $ 114.1 | € 585.8 | $ 0.0 | € 645.8
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 299.1 | € 172.8 | 512.2 | € 0.0 | 496.2 | € 0.0
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) | 11.6 | 11.6 | 23.2 | 23.2 | 12.7 | 12.7
Regulated Utility Operations | FTRs contracts (Kilowatt hours) | Electricity |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 0.0 | 0.0 | 0.0 | 0.0 | 25.5 | 25.5

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