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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Total gains (losses) included in:
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities		$ (85.8)			$ 204.1			$ (2.0)	$ (254.9)
Fair Value, Measurements, Recurring [Member]
Financial assets [Abstract]
Value before application of CME Rule 814		433.9						433.9		$ 456.9
Impact of CME Rule 814		(261.3)						(261.3)		(295.0)
Total commodity derivatives		172.6						172.6		161.9
Total		172.6						172.6		161.9
Financial liabilities [Abstract]
Liquidity option agreement		513.1						513.1		390.0
Interest rate derivatives		118.6						118.6
Commodity derivatives:
Value before application of CME Rule 814		356.0						356.0		398.1
Impact of CME Rule 814		(205.5)						(205.5)		(235.7)
Total commodity derivatives		150.5						150.5		162.4
Total		782.2						782.2		552.4
Net value before application of CME Rule 814 to commodity hedging portfolio		77.9						77.9
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814		54.0						54.0		172.3
Impact of CME Rule 814		(44.8)						(44.8)		(134.8)
Total commodity derivatives		9.2						9.2		37.5
Total		9.2						9.2		37.5
Financial liabilities [Abstract]
Liquidity option agreement		0.0						0.0		0.0
Interest rate derivatives		0.0						0.0
Commodity derivatives:
Value before application of CME Rule 814		39.8						39.8		85.5
Impact of CME Rule 814		(31.0)						(31.0)		(48.6)
Total commodity derivatives		8.8						8.8		36.9
Total		8.8						8.8		36.9
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814		365.4						365.4		282.4
Impact of CME Rule 814		(206.3)						(206.3)		(159.3)
Total commodity derivatives		159.1						159.1		123.1
Total		159.1						159.1		123.1
Financial liabilities [Abstract]
Liquidity option agreement		0.0						0.0		0.0
Interest rate derivatives		118.6						118.6
Commodity derivatives:
Value before application of CME Rule 814		268.3						268.3		291.2
Impact of CME Rule 814		(138.5)						(138.5)		(172.9)
Total commodity derivatives		129.8						129.8		118.3
Total		248.4						248.4		118.3
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814		14.5						14.5		2.2
Impact of CME Rule 814		(10.2)						(10.2)		(0.9)
Total commodity derivatives		4.3						4.3		1.3
Total		4.3						4.3		1.3
Financial liabilities [Abstract]
Liquidity option agreement		513.1						513.1		390.0
Interest rate derivatives		0.0						0.0
Commodity derivatives:
Value before application of CME Rule 814		47.9						47.9		21.4
Impact of CME Rule 814		(36.0)						(36.0)		(14.2)
Total commodity derivatives		11.9						11.9		7.2
Total		525.0						525.0		$ 397.2
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]
Financial liability balance, net, beginning of period		(479.6)	$ (446.9)	$ (395.9)	(349.0)	$ (341.9)	$ (332.7)	(395.9)	(332.7)
Total gains (losses) included in:
Transfers out of Level 3		0.0	0.0	(0.2)	0.0	0.0	0.0
Financial liability balance, net, end of period		(520.7)	(479.6)	(446.9)	(366.2)	(349.0)	(341.9)	(520.7)	(366.2)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities		0.8			(1.5)			$ 0.6	$ (1.4)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member]
Total gains (losses) included in:
Net income	[1]	0.8	(0.1)	3.1	(0.2)	1.3	(0.5)
Settlements	[1]	0.0	(3.1)	(0.1)	(1.3)	0.5	(1.2)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member]
Total gains (losses) included in:
Net income		(38.7)	(26.6)	(57.8)	(18.5)	(8.9)	(7.5)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member]
Total gains (losses) included in:
Other comprehensive income		$ (3.2)	$ (2.9)	$ 4.0	$ 2.8	$ 0.0	$ 0.0
[1] There were $0.8 million and $0.6 million of unrealized gains included in these amounts for the three and nine months ended September 30, 2019, respectively.  There were unrealized losses of $1.5 million and $1.4 million, respectively, included in these amounts for the three and nine months ended September 30, 2018.

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