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Retirement and Postretirement Plans (Qualified Plan's Assets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Plan Assets |  |  |
Fair value | $ 142.8 | $ 124.7 | $ 120.8
Qualified Plan |  |  |
Plan Assets |  |  |
Fair value | 142.1 | 124.0 |
Asset allocations (as a percent) | 100.00% | 100.00% |
Qualified Plan | Level 1 Inputs |  |  |
Plan Assets |  |  |
Fair value | 112.1 | 87.6 |
Qualified Plan | Level 2 Inputs |  |  |
Plan Assets |  |  |
Fair value | 30.0 | 36.4 |
Qualified Plan | Level 3 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Fixed maturity investments |  |  |
Plan Assets |  |  |
Fair value | 0 | 1.9 |
Asset allocations (as a percent) | 0.00% | 1.50% |
Qualified Plan | Fixed maturity investments | Level 1 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Fixed maturity investments | Level 2 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 1.9 |
Qualified Plan | Fixed maturity investments | Level 3 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Common equity securities |  |  |
Plan Assets |  |  |
Fair value | 103.3 | 79.5 |
Asset allocations (as a percent) | 72.70% | 64.20% |
Qualified Plan | Common equity securities | Level 1 Inputs |  |  |
Plan Assets |  |  |
Fair value | 103.3 | 79.5 |
Qualified Plan | Common equity securities | Level 2 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Common equity securities | Level 3 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Convertible fixed maturity investments |  |  |
Plan Assets |  |  |
Fair value | 29.9 | 34.5 |
Asset allocations (as a percent) | 21.10% | 27.80% |
Qualified Plan | Convertible fixed maturity investments | Level 1 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Convertible fixed maturity investments | Level 2 Inputs |  |  |
Plan Assets |  |  |
Fair value | 29.9 | 34.5 |
Qualified Plan | Convertible fixed maturity investments | Level 3 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0 | 0 |
Qualified Plan | Cash |  |  |
Plan Assets |  |  |
Fair value | 8.9 | 8.1 |
Asset allocations (as a percent) | 6.20% | 6.50% |
Qualified Plan | Cash | Level 1 Inputs |  |  |
Plan Assets |  |  |
Fair value | 8.8 | 8.1 |
Qualified Plan | Cash | Level 2 Inputs |  |  |
Plan Assets |  |  |
Fair value | 0.1 | 0 |
Qualified Plan | Cash | Level 3 Inputs |  |  |
Plan Assets |  |  |
Fair value | $ 0 | $ 0 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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