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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures, Activity in Level 3 (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Pension [Member] | Equity Securities (ARS) [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance |  | $ 6.7
Actual Return on Plan Assets |  | 0
Purchases, sales and settlements, net |  | (6.7)
Ending Balance |  | 0
Pension [Member] | Private Equity Funds [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 69.0 | 50.7
Actual Return on Plan Assets | (9.7) | 30.9
Purchases, sales and settlements, net | (0.4) | (12.6)
Ending Balance | 58.9 | 69.0
Pension [Member] | Real Estate [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 21.7 | 20.1
Actual Return on Plan Assets | 3.4 | 3.5
Purchases, sales and settlements, net | (0.2) | (1.9)
Ending Balance | 24.9 | 21.7
Postretirement Health and Life [Member] | Private Equity Funds [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 14.0 | 12.4
Actual Return on Plan Assets | 0.2 | 1.1
Purchases, sales and settlements, net | (0.7) | 0.5
Ending Balance | $ 13.5 | $ 14.0

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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + 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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: 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. + Details
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