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Retirement and Postretirement Plans (Qualified Plan's Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 139.8 | $ 146.0 | $ 142.8
Qualified Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 139.4 | $ 143.2 |
Asset allocations (as a percent) | 100.00% | 100.00% |
Qualified Plan [Member] | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 139.4 | $ 105.8 |
Qualified Plan [Member] | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 37.4 |
Qualified Plan [Member] | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Fixed maturity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 132.4 | $ 24.2 |
Asset allocations (as a percent) | 95.00% | 16.90% |
Qualified Plan [Member] | Fixed maturity investments | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 132.4 | $ 0.0 |
Qualified Plan [Member] | Fixed maturity investments | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 24.2 |
Qualified Plan [Member] | Fixed maturity investments | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Common equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 101.0 |
Asset allocations (as a percent) | 0.00% | 70.60% |
Qualified Plan [Member] | Common equity securities | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 101.0 |
Qualified Plan [Member] | Common equity securities | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Common equity securities | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Convertible fixed maturity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 12.8 |
Asset allocations (as a percent) | 0.00% | 8.90% |
Qualified Plan [Member] | Convertible fixed maturity investments | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 0.0 |
Qualified Plan [Member] | Convertible fixed maturity investments | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 12.8 |
Qualified Plan [Member] | Convertible fixed maturity investments | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 7.0 | $ 5.2 |
Asset allocations (as a percent) | 5.00% | 3.60% |
Qualified Plan [Member] | Cash | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 7.0 | $ 4.8 |
Qualified Plan [Member] | Cash | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.4 |
Qualified Plan [Member] | Cash | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + 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=58740216&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=58740216&loc=d3e1928-114920 + Details
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