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Retirement and Postretirement Plans (Qualified Plan's Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 13.0 | $ 139.8 | $ 146.0
Qualified Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 12.8 | $ 139.4 |
Asset allocations (as a percent) | 100.00% | 100.00% |
Qualified Plan [Member] | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 12.8 | $ 139.4 |
Qualified Plan [Member] | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 0.0 |
Qualified Plan [Member] | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Asset allocations (as a percent) | 1.50% | 5.00% |
Qualified Plan [Member] | Fixed maturity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 132.4 |
Asset allocations (as a percent) | 0.00% | 95.00% |
Qualified Plan [Member] | Fixed maturity investments | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 132.4 |
Qualified Plan [Member] | Fixed maturity investments | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
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 | $ 12.8 | $ 0.0 |
Asset allocations (as a percent) | 98.50% | 0.00% |
Qualified Plan [Member] | Common equity securities | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 12.8 | $ 0.0 |
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] | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 7.0 |
Qualified Plan [Member] | Short-term investments | Level 1 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 7.0 |
Qualified Plan [Member] | Short-term investments | Level 2 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | 0.0 | 0.0 |
Qualified Plan [Member] | Short-term investments | Level 3 Inputs |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value | $ 0.0 | $ 0.0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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