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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	Dec. 31, 2018 EUR (€) DTH kWh gal	Dec. 31, 2018 USD ($) DTH kWh gal	Sep. 30, 2018 EUR (€) DTH kWh gal	Sep. 30, 2018 USD ($) DTH kWh gal	Dec. 31, 2017 EUR (€) DTH kWh gal	Dec. 31, 2017 USD ($) DTH kWh gal
Commodity contracts | Electricity | Long
Derivative [Line Items]
Notional amount (in units) | kWh	3,974.7	3,974.7	4,307.6	4,307.6	4,733.9	4,733.9
Commodity contracts | Electricity | Short
Derivative [Line Items]
Notional amount (in units) | kWh	366.7	366.7	359.3	359.3	325.2	325.2
Commodity contracts | Propane
Derivative [Line Items]
Notional amount (in units) | gal	450.4	450.4	394.3	394.3	275.4	275.4
Natural gas futures, forward and pipeline contracts (in dekatherms) | Natural Gas
Derivative [Line Items]
Notional amount (in units)	188.0	188.0	159.7	159.7	128.3	128.3
Natural gas basis swap contracts (in dekatherms) | Natural Gas
Derivative [Line Items]
Notional amount (in units)	81.2	81.2	54.4	54.4	90.2	90.2
NYMEX natural gas storage (in dekatherms) | Natural Gas
Derivative [Line Items]
Notional amount (in units)	0.7	0.7	1.8	1.8	1.3	1.3
NYMEX propane storage (in gallons) | Propane
Derivative [Line Items]
Notional amount (in units) | gal	0.3	0.3	0.6	0.6	0.1	0.1
Interest rate swaps
Derivative [Line Items]
Notional amount	€ 300.0	$ 114.1	€ 585.8	$ 114.1	€ 645.8	$ 0.0
Forward foreign currency exchange contracts
Derivative [Line Items]
Notional amount	€ 172.8	408.6	€ 0.0	512.2	€ 0.0	485.7
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)	14.7	14.7	23.2	23.2	13.4	13.4
Regulated Utility Operations | FTRs (in kilowatts) | Electricity
Derivative [Line Items]
Notional amount (in units) | kWh	0.0	0.0	0.0	0.0	63.1	63.1

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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