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v3.10.0.1

Other Reinsurance Assumed Insurance (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) employees director | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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 | $ 20.0 | $ 20.7 | $ 21.3
Capitol [Member] | Trinity [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Earned Premiums Assumed, Percentage | 100.00% |  |
ORCC [Member] |  |  |
Assumed Insurance [Line Items] |  |  |
Assumed Premiums Earned | $ 5.6 | 5.9 | 6.2
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 | $ 85.2 | $ 72.9 | $ 67.3

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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 Number of Board of Director Members + References No definition available. + Details
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- Definition Number of Company Employee Board Members + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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- Details
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