Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)	3 Months Ended
Mar. 31, 2021 CAD ($) MWh MMBTU T
Natural gas (MMBtu)
Derivative [Line Items]
Commodity, energy measures \| MMBTU	1,877,516,146
Electricity (MWh)
Derivative [Line Items]
Commodity, energy measures	34,963,827
Foreign currency exchange ($ CAD)
Derivative [Line Items]
Commodity, monetary measure \| $	$ 135,478,800
Renewable Energy Certificates (MWh)
Derivative [Line Items]
Commodity, energy measures	11,304,487
Carbon emissions (Metric Tons)
Derivative [Line Items]
Commodity, mass measure \| T	11,696,283

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Nominal energy measure used to calculate payments on a derivative instrument.

+ References

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Nominal mass used to calculate payments on a derivative instrument.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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