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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, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Total gains (losses) included in:
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities								$ (254.9)	$ 14.2
Fair Value, Measurements, Recurring [Member]
Financial assets [Abstract]
Interest rate derivatives		$ 19.1						19.1		$ 0.1
Value before application of CME Rule 814		430.4						430.4		234.9
Impact of CME Rule 814 change		(147.0)						(147.0)		(73.2)
Total commodity derivatives		283.4						283.4		161.7
Total		302.5						302.5		161.8
Financial liabilities [Abstract]
Liquidity option agreement		368.8						368.8		333.9
Interest rate derivatives		0.0						0.0		1.7
Commodity derivatives:
Value before application of CME Rule 814		1,014.5						1,014.5		390.7
Impact of CME Rule 814 change		(454.0)						(454.0)		(213.8)
Total commodity derivatives		560.5						560.5		176.9
Total		929.3						929.3		512.5
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.0						0.0		0.0
Value before application of CME Rule 814		140.5						140.5		47.1
Impact of CME Rule 814 change		(11.5)						(11.5)		(47.1)
Total commodity derivatives		129.0						129.0		0.0
Total		129.0						129.0		0.0
Financial liabilities [Abstract]
Liquidity option agreement		0.0						0.0		0.0
Interest rate derivatives		0.0						0.0		0.0
Commodity derivatives:
Value before application of CME Rule 814		183.7						183.7		118.4
Impact of CME Rule 814 change		(55.5)						(55.5)		(118.4)
Total commodity derivatives		128.2						128.2		0.0
Total		128.2						128.2		0.0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Financial assets [Abstract]
Interest rate derivatives		19.1						19.1		0.1
Value before application of CME Rule 814		284.0						284.0		184.9
Impact of CME Rule 814 change		(135.5)						(135.5)		(26.1)
Total commodity derivatives		148.5						148.5		158.8
Total		167.6						167.6		158.9
Financial liabilities [Abstract]
Liquidity option agreement		0.0						0.0		0.0
Interest rate derivatives		0.0						0.0		1.7
Commodity derivatives:
Value before application of CME Rule 814		827.5						827.5		270.6
Impact of CME Rule 814 change		(398.5)						(398.5)		(95.4)
Total commodity derivatives		429.0						429.0		175.2
Total		429.0						429.0		176.9
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.0						0.0		0.0
Value before application of CME Rule 814		5.9						5.9		2.9
Impact of CME Rule 814 change		0.0						0.0		0.0
Total commodity derivatives		5.9						5.9		2.9
Total		5.9						5.9		2.9
Financial liabilities [Abstract]
Liquidity option agreement		368.8						368.8		333.9
Interest rate derivatives		0.0						0.0		0.0
Commodity derivatives:
Value before application of CME Rule 814		3.3						3.3		1.7
Impact of CME Rule 814 change		0.0						0.0		0.0
Total commodity derivatives		3.3						3.3		1.7
Total		372.1						372.1		$ 335.6
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]
Financial liability balance, net, beginning of period		(349.0)	$ (341.9)	$ (332.7)	$ (293.5)	$ (274.4)	$ (268.2)	(332.7)	(268.2)
Total gains (losses) included in:
Transfers out of Level 3		0.0	0.0	0.0	0.0	0.0	0.0
Financial liability balance, net, end of period		(366.2)	(349.0)	(341.9)	(302.2)	(293.5)	(274.4)	(366.2)	(302.2)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities		(1.5)			0.2			$ (1.4)	$ (1.1)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member]
Total gains (losses) included in:
Net income	[1]	(0.2)	1.3	(0.5)	0.3	0.1	0.7
Settlements	[1]	(1.3)	0.5	(1.2)	(0.1)	(0.7)	(1.4)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member]
Total gains (losses) included in:
Net income		(18.5)	(8.9)	(7.5)	(8.9)	(18.6)	(5.5)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member]
Total gains (losses) included in:
Other comprehensive income		$ 2.8	$ 0.0	$ 0.0	$ 0.0	$ 0.1	$ 0.0
[1] There were $1.5 million and $1.4 million of unrealized losses included in these amounts for the three and nine months ended September 30, 2018, respectively. There were unrealized gains of $0.2 million and unrealized losses of $1.1 million included in these amounts for the three and nine months ended September 30, 2017.

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