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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, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Total gains (losses) included in:
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities								$ 14.2	$ (42.1)
Fair Value, Measurements, Recurring [Member]
Financial assets [Abstract]
Interest rate derivatives		$ 0.8						0.8		$ 36.5
Value before application of CME Rule 814		381.9						381.9
Impact of CME Rule 814 change		(197.9)						(197.9)
Total commodity derivatives		184.0						184.0		541.4
Total		184.8						184.8		577.9
Financial liabilities [Abstract]
Liquidity option agreement		302.6						302.6		269.6
Interest rate derivatives		1.6						1.6		1.1
Commodity derivatives:
Value before application of CME Rule 814		648.1						648.1
Impact of CME Rule 814 change		(417.3)						(417.3)
Total commodity derivatives		230.8						230.8		739.4
Total		535.0						535.0		1,010.1
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		10.3						10.3
Impact of CME Rule 814 change		(10.3)						(10.3)
Total commodity derivatives		0.0						0.0		84.5
Total		0.0						0.0		84.5
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		38.8						38.8
Impact of CME Rule 814 change		(38.8)						(38.8)
Total commodity derivatives		0.0						0.0		136.8
Total		0.0						0.0		136.8
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.8						0.8		36.5
Value before application of CME Rule 814		370.2						370.2
Impact of CME Rule 814 change		(187.6)						(187.6)
Total commodity derivatives		182.6						182.6		455.2
Total		183.4						183.4		491.7
Financial liabilities [Abstract]
Liquidity option agreement		0.0						0.0		0.0
Interest rate derivatives		1.6						1.6		1.1
Commodity derivatives:
Value before application of CME Rule 814		608.3						608.3
Impact of CME Rule 814 change		(378.5)						(378.5)
Total commodity derivatives		229.8						229.8		602.3
Total		231.4						231.4		603.4
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		1.4						1.4
Impact of CME Rule 814 change		0.0						0.0
Total commodity derivatives		1.4						1.4		1.7
Total		1.4						1.4		1.7
Financial liabilities [Abstract]
Liquidity option agreement		302.6						302.6		269.6
Interest rate derivatives		0.0						0.0		0.0
Commodity derivatives:
Value before application of CME Rule 814		1.0						1.0
Impact of CME Rule 814 change		0.0						0.0
Total commodity derivatives		1.0						1.0		0.3
Total		303.6						303.6		$ 269.9
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]
Financial liability balance, net, beginning of period		(293.5)	$ (274.4)	$ (268.2)	$ (263.7)	$ (242.3)	$ (246.7)	(268.2)	(246.7)
Total gains (losses) included in:
Transfers out of Level 3		0.0	0.0	0.0	0.0	0.0	0.1
Financial liability balance, net, end of period		(302.2)	(293.5)	(274.4)	(274.7)	(263.7)	(242.3)	(302.2)	(274.7)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities		0.2			0.0			$ (1.1)	$ 0.5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Revenue [Member]
Total gains (losses) included in:
Net income	[1]	0.3	0.1	0.7	0.2	0.0	0.7
Settlements	[1]	(0.1)	(0.7)	(1.4)	(0.2)	(0.1)	(0.1)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Expense [Member]
Total gains (losses) included in:
Net income		(8.9)	(18.6)	(5.5)	(6.9)	(23.3)	2.2
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Comprehensive Income (Loss) [Member]
Total gains (losses) included in:
Other comprehensive income		$ 0.0	$ 0.1	$ 0.0	$ (4.1)	$ 2.0	$ 1.5
[1] There were $0.2 million of unrealized gains and $1.1 million of unrealized losses included in these amounts for the three and nine months ended September 30, 2017, respectively. There were unrealized gains of $0.5 million included in these amounts for the nine months ended September 30, 2016.

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