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Reclassifications out of Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Accumulated Other Comprehensive Loss [Roll Forward] |  |  |
Beginning Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities | $ (0.1) | [1] |
Beginning Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items | (21.5) | [1] |
Beginning Accumulated Other Comprehensive Loss, Gains and Losses on Cash Flow Hedge | (0.4) | [1] |
Beginning Accumulated Other Comprehensive Loss, Total | (22.0) | [1] |
Other Comprehensive Income (Loss) before Reclassifications [Abstract] |  |  |
Other Comprehensive Income (Loss) Before Reclassifications, Unrealized Gains and Losses on Available-for-sale Securities | 0.5 | [1] |
Other Comprehensive Income (Loss) Before Reclassifications, Defined Benefit Pension and Other Postretirement Items | (2.9) | [1] |
Other Comprehensive Income (Loss) Before Reclassifications, Gains and Losses on Cash Flow Hedge | 0.1 | [1] |
Other Comprehensive Income (Loss) Before Recalssifications, Total | (2.3) | [1] |
Available-for-sale Securities [Abstract] |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities | 0.5 | [1] |
Pension and Other Postretirement Benefit Plans [Abstract] |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items | (3.2) | [1],[2] |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items, Before Tax | (5.2) | [2] |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Amortization of Defined Benefit Pension and Other Postretirement Items, Prior Service Costs, Before Tax | 0.5 | [3] |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Amortization of Defined Benefit Pension and Other Postretirement Items, Actuarial Gains and Losses, Before Tax | (5.7) | [2],[3] |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Gains and Losses on Cash Flow Hedge | 0 | [1],[4] |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Total Reclassifications | (2.7) | [1],[2] |
Net Other Comprehensive Income (Loss) [Abstract] |  |  |
Net Other Comprehensive Income, Unrealized Gains and Losses on Available-for-sale Securities | 0 | [1] | 1.0
Net Other Comprehensive Income, Defined Benefit Pension and Other Postretirement Items | 0.3 | [1] | 0.5
Net Other Comprehensive Income, Gains and Losses on Cash Flow Hedge | 0.1 | [1] | (0.1)
Net Other Comprehensive Income, Total | 0.4 | [1] | 1.4
Ending Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities | (0.1) | [1] |
Ending Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items | (21.2) | [1] |
Ending Accumulated Other Comprehensive Loss, Gains and Losses on Cash Flow Hedge | (0.3) | [1] |
Ending Accumulated Other Comprehensive Loss, Total | (21.6) | [1] |
Other Income [Member] |  |  |
Available-for-sale Securities [Abstract] |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities, Before Tax | 0.8 |  |
Income Tax Expense (Benefit) [Member] |  |  |
Available-for-sale Securities [Abstract] |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities, Tax | (0.3) | [2] |
Pension and Other Postretirement Benefit Plans [Abstract] |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items, Tax | $ 2.0 |  |
[1] | Amounts shown are net of tax.
[2] | Amounts in parentheses indicate charges to net income.
[3] | These components of accumulated other comprehensive loss are included in the computation of net pension and other postretirement benefit expense. (See Note 13. Pension and Other Postretirement Benefit Plans.)
[4] | There were no amounts reclassified from accumulated other comprehensive loss related to the cash flow hedge.

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -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 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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- Definition The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -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 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j-k) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -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 Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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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