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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financial assets [Abstract]
Interest rate derivatives		$ 12.4
Value before application of CME Rule 814	$ 2,779.5	1,570.1
Impact of CME Rule 814	(2,067.8)	(1,340.9)
Total commodity derivatives	711.7	229.2
Total	711.7	241.6
Financial liabilities [Abstract]
Interest rate derivatives		120.1
Commodity derivatives:
Value before application of CME Rule 814	3,249.8	2,138.9
Impact of CME Rule 814	(2,459.9)	(1,892.6)
Total commodity derivatives	789.9	246.3
Total	789.9	366.4
Net value before application of CME Rule 814 to commodity hedging portfolio	(470.3)
Level 1 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.0
Value before application of CME Rule 814	435.3	678.6
Impact of CME Rule 814	(435.3)	(678.6)
Total commodity derivatives	0.0	0.0
Total	0.0	0.0
Financial liabilities [Abstract]
Interest rate derivatives		0.0
Commodity derivatives:
Value before application of CME Rule 814	655.1	1,065.6
Impact of CME Rule 814	(655.1)	(1,065.6)
Total commodity derivatives	0.0	0.0
Total	0.0	0.0
Level 2 [Member]
Financial assets [Abstract]
Interest rate derivatives		12.4
Value before application of CME Rule 814	2,344.1	878.6
Impact of CME Rule 814	(1,632.5)	(650.4)
Total commodity derivatives	711.6	228.2
Total	711.6	240.6
Financial liabilities [Abstract]
Interest rate derivatives		120.1
Commodity derivatives:
Value before application of CME Rule 814	2,594.5	1,047.4
Impact of CME Rule 814	(1,804.8)	(807.3)
Total commodity derivatives	789.7	240.1
Total	789.7	360.2
Level 3 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.0
Value before application of CME Rule 814	0.1	12.9
Impact of CME Rule 814	0.0	(11.9)
Total commodity derivatives	0.1	1.0
Total	0.1	1.0
Financial liabilities [Abstract]
Interest rate derivatives		0.0
Commodity derivatives:
Value before application of CME Rule 814	0.2	25.9
Impact of CME Rule 814	0.0	(19.7)
Total commodity derivatives	0.2	6.2
Total	$ 0.2	$ 6.2

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