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v3.8.0.1

Other Reinsurance Assumed Insurance (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) employees director | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Assumed Insurance [Line Items] |  |  |
Assumed Premiums Earned | $ 72.9 | $ 67.3 | $ 60.1
Capitol [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Number of Company Employee Board Members | employees | 5 |  |
Number of Board of Director Members | director | 5 |  |
ORCC [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Number of Company Employee Board Members | employees | 9 |  |
Number of Board of Director Members | director | 9 |  |
Capitol [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Assumed Premiums Earned | $ 20.7 | 21.3 | 21.8
Capitol [Member] | Trinity [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Earned Premiums Assumed, Percentage | 100.00% |  |
ORCC [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Assumed Premiums Earned | $ 5.9 | 6.2 | 6.5
ORCC [Member] | Trinity [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Earned Premiums Assumed, Percentage | 100.00% |  |
Non-Catastrophe Reinsurance [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Assumed Premiums Earned | $ 72.9 | $ 67.3 | $ 60.0

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- Definition Assumed Insurance [Line Items] + References No definition available. + Details
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- Definition Premiums assumed for all other insurance from other insurers as a result of reinsurance arrangements, percentage. + References No definition available. + Details
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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: 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 Reference 2: 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 3: 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 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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