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Recurring Fair Value Measures, Activity in Level 3 (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Derivatives [Member] |  |  |  |
Recurring Fair Value Measures, Activity in Level 3 [Line Items] |  |  |  |
Beginning Balance |  |  | $ 0.7 |
Settled During the Period |  |  | (0.7) | [1]
Redeemed During the Period |  |  | 0 |
Ending Balance |  |  | 0 |
Debt Securities Issued by States of the United States (ARS) [Member] |  |  |  |
Recurring Fair Value Measures, Activity in Level 3 [Line Items] |  |  |  |
Beginning Balance | 6.7 |  | 6.7 |
Settled During the Period | 0 |  | 0 |
Redeemed During the Period | (6.7) | [2] | 0 |
Ending Balance | $ 0 |  | $ 6.7 |
[1] | (a)During the second quarter of 2010, the $0.7 million of financial transmission rights derivatives were settled.
[2] | (a)The ARS were redeemed at carrying value on January 5, 2011.

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- Definition Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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