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Catastrophe Reinsurance - Catastrophe Reinsurance Premiums (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded Catastrophe Reinsurance Premiums | $ 18.2 | $ 19.0 | $ 20.6
Catastrophe Reinsurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded Catastrophe Reinsurance Premiums | 11.0 | 12.0 | 12.9
Property and Casualty Insurance [Member] | Catastrophe Reinsurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded Catastrophe Reinsurance Premiums | 10.9 | 11.9 | 12.8
Life and Health Insurance [Member] | Catastrophe Reinsurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded Catastrophe Reinsurance Premiums | 0.1 | $ 0.1 | $ 0.1
Reinstatement Premium [Member] | Property and Casualty Insurance [Member] | Catastrophe Reinsurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded Catastrophe Reinsurance Premiums | $ 0.8 |  |

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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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