Fair Value Measurements (Details) (USD $) In Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Fair value assets and liabilities measured on recurring basis
Derivative assets, current	$ 233.8	$ 233.8	$ 534.4
Derivative assets, noncurrent	258.2	258.2	258.9
Derivative liabilities, current	(487.8)	(487.8)	(622.3)
Derivative liabilities, noncurrent	(239.7)	(239.7)	(353.0)
Derivatives classified as accounts receivable	(198.6)	(198.6)	(16.4)
Derivative assets, net	293.4	293.4	776.9
Derivative assets, gross	10,258.2	10,258.2	13,760.8
Net fair values, derivative liabilities	(727.5)	(727.5)	(975.3)
Derivative liabilities, gross	(10,612.8)	(10,612.8)	(13,931.4)
Cash collateral held	81.4	81.4	28.4
Cash collateral posted	1.9	1.9	0.6
Power contracts \| Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	3,987.0	3,987.0	7,509.6
Derivative liabilities, gross	(4,100.9)	(4,100.9)	(7,758.2)
Power contracts \| Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	658.3	658.3	453.3
Derivative liabilities, gross	(905.3)	(905.3)	(771.1)
Gas contracts \| Recurring Measurements \| Level 1
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	182.6	182.6	63.9
Derivative liabilities, gross	(172.6)	(172.6)	(72.7)
Gas contracts \| Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	4,115.9	4,115.9	5,113.3
Derivative liabilities, gross	(4,359.7)	(4,359.7)	(4,910.3)
Gas contracts \| Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	518.6	518.6	115.2
Derivative liabilities, gross	(365.3)	(365.3)	(5.1)
Coal contracts \| Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	136.9	136.9	355.6
Derivative liabilities, gross	(119.0)	(119.0)	(307.4)
Coal contracts \| Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	0.5	0.5	7.4
Derivative liabilities, gross	(0.1)	(0.1)	(0.9)
Other commodity contracts \| Recurring Measurements \| Level 1
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	28.0	28.0	6.6
Derivative liabilities, gross	(28.2)	(28.2)	(7.1)
Other commodity contracts \| Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	163.3	163.3	54.8
Derivative liabilities, gross	(154.8)	(154.8)	(54.5)
Other commodity contracts \| Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	347.6	347.6
Derivative liabilities, gross	(346.2)	(346.2)
Interest rate contracts \| Recurring Measurements \| Level 1
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	50.3	50.3	33.1
Derivative liabilities, gross	(50.6)	(50.6)	(35.7)
Interest rate contracts \| Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	54.4	54.4	37.0
Derivative liabilities, gross	(1.3)	(1.3)
Interest rate contracts \| Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative liabilities, gross	(3.3)	(3.3)
Foreign exchange contracts \| Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	14.4	14.4	11.0
Derivative liabilities, gross	(5.5)	(5.5)	(8.4)
Equity contracts \| Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	0.4	0.4
Recurring Measurements
Fair value assets and liabilities measured on recurring basis
Cash equivalents	625.6	625.6	1,545.4
Equity securities-mutual funds	51.2	51.2	43.7
Derivative assets, current	233.8	233.8	534.4
Derivative assets, noncurrent	258.2	258.2	258.9
Derivative liabilities, current	(487.8)	(487.8)	(622.3)
Derivative liabilities, noncurrent	(239.7)	(239.7)	(353.0)
Derivative instruments classified as derivative assets	492.0	492.0	793.3
Derivative instruments classified as derivative liabilities	(727.5)	(727.5)	(975.3)
Derivatives classified as accounts receivable	(198.6)	(198.6)	(16.4)
Derivative assets, net	293.4	293.4	776.9
Net fair values, derivative liabilities	(727.5)	(727.5)	(975.3)
Assets measured at fair value	970.2	970.2	2,366.0
Liabilities measured at fair value	(727.5)	(727.5)	(975.3)
Cash collateral held		81.4	28.4
Cash collateral posted	1.9	1.9	0.6
Recurring Measurements \| Level 1
Fair value assets and liabilities measured on recurring basis
Cash equivalents	625.6	625.6	1,545.4
Equity securities-mutual funds	51.2	51.2	43.7
Derivative assets, gross	260.9	260.9	103.6
Derivative liabilities, gross	(251.4)	(251.4)	(115.5)
Net derivative position	9.5	9.5	(11.9)
Assets and liabilities, net, measured at fair value	686.3	686.3	1,577.2
Recurring Measurements \| Level 2
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	8,471.9	8,471.9	13,081.3
Derivative liabilities, gross	(8,741.2)	(8,741.2)	(13,038.8)
Net derivative position	(269.3)	(269.3)	42.5
Assets and liabilities, net, measured at fair value	(269.3)	(269.3)	42.5
Recurring Measurements \| Level 3
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	1,525.4	1,525.4	575.9
Derivative liabilities, gross	(1,620.2)	(1,620.2)	(777.1)
Net derivative position	(94.8)	(94.8)	(201.2)
Assets and liabilities, net, measured at fair value	(94.8)	(94.8)	(201.2)
Recurring Measurements \| Netting and Cash Collateral
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	(9,964.8)	(9,964.8)	(12,983.9)
Derivative liabilities, gross	9,885.3	9,885.3	12,956.1
Net derivative position	(79.5)	(79.5)	(27.8)
Assets and liabilities, net, measured at fair value	(79.5)	(79.5)	(27.8)
Recurring Measurements \| Fair Value
Fair value assets and liabilities measured on recurring basis
Cash equivalents	625.6	625.6	1,545.4
Equity securities-mutual funds	51.2	51.2	43.7
Derivative assets, gross	293.4	293.4	776.9
Derivative liabilities, gross	(727.5)	(727.5)	(975.3)
Net derivative position	(434.1)	(434.1)	(198.4)
Assets and liabilities, net, measured at fair value	242.7	242.7	1,390.7
Power contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	4,645.3	4,645.3	7,962.9
Derivative liabilities, gross	(5,006.2)	(5,006.2)	(8,529.3)
Gas contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	4,817.1	4,817.1	5,292.4
Derivative liabilities, gross	(4,897.6)	(4,897.6)	(4,988.1)
Coal contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	137.4	137.4	363.0
Derivative liabilities, gross	(119.1)	(119.1)	(308.3)
Other commodity contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	538.9	538.9	61.4
Derivative liabilities, gross	(529.2)	(529.2)	(61.6)
Interest rate contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	104.7	104.7	70.1
Derivative liabilities, gross	(55.2)	(55.2)	(35.7)
Foreign exchange contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	14.4	14.4	11.0
Derivative liabilities, gross	(5.5)	(5.5)	(8.4)
Equity contracts
Fair value assets and liabilities measured on recurring basis
Derivative assets, gross	$ 0.4	$ 0.4

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