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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 | Jun. 30, 2019 USD ($) DTH gal kWh | Jun. 30, 2019 EUR (€) DTH gal kWh | Sep. 30, 2018 USD ($) DTH gal kWh | Sep. 30, 2018 EUR (€) DTH gal kWh | Jun. 30, 2018 USD ($) DTH gal kWh | Jun. 30, 2018 EUR (€) DTH gal kWh
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Commodity contracts | Electricity | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 3,140.0 | 3,140.0 | 4,307.6 | 4,307.6 | 4,283.0 | 4,283.0
Commodity contracts | Electricity | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | kWh | 589.3 | 589.3 | 359.3 | 359.3 | 424.2 | 424.2
Commodity contracts | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 635.2 | 635.2 | 394.3 | 394.3 | 339.7 | 339.7
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 191.4 | 191.4 | 159.7 | 159.7 | 139.6 | 139.6
Natural gas basis swap contracts (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 90.3 | 90.3 | 54.4 | 54.4 | 64.1 | 64.1
NYMEX natural gas storage (in dekatherms) | Natural Gas |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | 1.7 | 1.7 | 1.8 | 1.8 | 1.4 | 1.4
NYMEX propane storage (in gallons) | Propane |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount (in units) | gal | 0.5 | 0.5 | 0.6 | 0.6 | 1.1 | 1.1
Interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 114.1 | € 300.0 | $ 114.1 | € 585.8 | $ 0.0 | € 585.8
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 436.7 | € 172.8 | 512.2 | € 0.0 | 492.7 | € 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) | 16.5 | 16.5 | 23.2 | 23.2 | 16.8 | 16.8

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