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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, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Total gains (losses) included in:
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities								$ 7.7	$ 3.8
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]
Financial asset (liability) balance, net, beginning of period		$ (232.8)	$ (221.6)	$ (219.3)	$ 2.6	$ 7.7	$ 3.2	(219.3)	3.2
Total gains (losses) included in:
Other comprehensive income		(15.5)	(1.0)	(1.5)	(2.5)	0.0	0.0
Settlements		0.3	0.2	(0.5)	0.1	(1.8)	(0.1)
Transfers out of Level 3		1.1	1.5	0.1	0.0	0.0	0.0
Financial asset (liability) balance, net, end of period		(251.5)	(232.8)	(221.6)	(0.7)	2.6	7.7	(251.5)	(0.7)
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities		0.0			0.8			(1.1)	$ 1.3
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Revenue [Member]
Total gains (losses) included in:
Net income	[1]	(0.3)	(0.4)	$ (0.4)	(0.9)	(3.3)	$ 4.6
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Other Expense [Member]
Total gains (losses) included in:
Net income		(4.3)	$ (11.5)		$ 0.0	$ 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Financial assets [Abstract]
Interest rate derivatives		7.6						7.6
Commodity derivatives		242.8						242.8		$ 226.6
Total		250.4						250.4
Financial liabilities [Abstract]
Liquidity Option Agreement		235.5						235.5		219.7
Commodity derivatives		197.1						197.1		147.4
Total		432.6						432.6		367.1
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.0						0.0
Commodity derivatives		84.1						84.1		37.8
Total		84.1						84.1
Financial liabilities [Abstract]
Liquidity Option Agreement		0.0						0.0		0.0
Commodity derivatives		37.4						37.4		13.8
Total		37.4						37.4		13.8
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]
Financial assets [Abstract]
Interest rate derivatives		7.6						7.6
Commodity derivatives		157.7						157.7		187.8
Total		165.3						165.3
Financial liabilities [Abstract]
Liquidity Option Agreement		0.0						0.0		0.0
Commodity derivatives		142.7						142.7		133.0
Total		142.7						142.7		133.0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]
Financial assets [Abstract]
Interest rate derivatives		0.0						0.0
Commodity derivatives		1.0						1.0		1.0
Total		1.0						1.0
Financial liabilities [Abstract]
Liquidity Option Agreement		235.5						235.5		219.7
Commodity derivatives		17.0						17.0		0.6
Total		$ 252.5						$ 252.5		$ 220.3
[1] There were $1.1 million of unrealized losses included in these amounts for the nine months ended September 30, 2015. There were unrealized gains of $0.8 million and $1.3 million included in these amounts for the three and nine months ended September 30, 2014, respectively.

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