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Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss | $ (21.0) | [1] |  | $ (21.0) | [1] |  | $ (21.6) | [1] | $ (22.0) | [1]
Other Comprehensive Income (Loss) Before Reclassifications | (2.5) | [1] |  | (4.8) | [1] |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss | (3.1) | [1],[2] |  | (5.8) | [1],[2] |  |  |  |  |
Net Other Comprehensive Income | 0.6 | [1] | (0.1) | 1.0 | [1] | 1.3 |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
AOCI Reclassification, Amortization of Defined Benefit Pension and Other Postretirement Items, Before Tax | (5.1) | [2] |  | (10.3) | [2] |  |  |  |  |
AOCI Reclassification, Amortization of Pension and Other Postretirement Items, Prior Service Costs, Before Tax | 0.7 | [3] |  | 1.2 | [3] |  |  |  |  |
AOCI Reclassification, Amortization of Defined Benefit Pension and Other Postretirement Items, Actuarial Gains and Losses, Before Tax | (5.8) | [2],[3] |  | (11.5) | [2],[3] |  |  |  |  |
Other Income (Expense) - Other [Member] |  |  |  |  |  |  |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
AOCI Reclassification, Unrealized Gains on Available-for-sale Securities, Before Tax |  |  |  | 0.8 |  |  |  |  |  |
Income Tax Expense [Member] |  |  |  |  |  |  |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
AOCI Reclassification, Unrealized Gains on Available-for-sale Securities, Tax |  |  |  | (0.3) | [2] |  |  |  |  |
AOCI Reclassification, Amortization of Defined Benefit Pension and Other Postretirement Items, Tax | 2.0 |  |  | 4.0 |  |  |  |  |  |
Unrealized Gains and Losses on Available-for-sale Securities [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss | 0 | [1] |  | 0 | [1] |  | (0.1) | [1] | (0.1) | [1]
Other Comprehensive Income (Loss) Before Reclassifications | 0.1 | [1] |  | 0.6 | [1] |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss | 0 | [1] |  | 0.5 | [1] |  |  |  |  |
Net Other Comprehensive Income | 0.1 | [1] |  | 0.1 | [1] |  |  |  |  |
Defined Benefit Pension, Other Postretirement Items [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss | (20.7) | [1] |  | (20.7) | [1] |  | (21.2) | [1] | (21.5) | [1]
Other Comprehensive Income (Loss) Before Reclassifications | (2.6) | [1] |  | (5.5) | [1] |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss | (3.1) | [1],[2] |  | (6.3) | [1],[2] |  |  |  |  |
Net Other Comprehensive Income | 0.5 | [1] |  | 0.8 | [1] |  |  |  |  |
Gains and Losses on Cash Flow Hedge [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss | (0.3) | [1] |  | (0.3) | [1] |  | (0.3) | [1] | (0.4) | [1]
Other Comprehensive Income (Loss) Before Reclassifications | 0 | [1] |  | 0.1 | [1] |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Loss | 0 | [1] |  | 0 | [1] |  |  |  |  |
Net Other Comprehensive Income | $ 0 | [1] |  | $ 0.1 | [1] |  |  |  |  |
[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.)

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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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 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=28358780&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 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: 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=28358780&loc=d3e637-108580 Reference 2: 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=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669619-108580 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 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=28358780&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 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans. + References No definition available. + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: 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=28358780&loc=d3e637-108580 Reference 2: 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=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References No definition available. + Details
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