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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
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Dec. 31, 2013 | Dec. 31, 2012
Pension [Member] | Private Equity Funds [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | $ 58.9 | $ 69.0
Actual Return on Plan Assets | 2.3 | (9.7)
Purchases, sales, and settlements, net | (14.4) | (0.4)
Ending Balance | 46.8 | 58.9
Pension [Member] | Real Estate [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 24.9 | 21.7
Actual Return on Plan Assets | 2.1 | 3.4
Purchases, sales, and settlements, net | (0.5) | (0.2)
Ending Balance | 26.5 | 24.9
Postretirement Health and Life [Member] | Private Equity Funds [Member] |  |
Activity in Level 3 [Roll Forward] |  |
Beginning Balance | 13.5 | 14.0
Actual Return on Plan Assets | 2.4 | 0.2
Purchases, sales, and settlements, net | (2.8) | (0.7)
Ending Balance | $ 13.1 | $ 13.5

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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=25499696&loc=d3e19207-110258 + Details
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