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Catastrophe Reinsurance - Catastrophe Losses and LAE (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] |  |  |
Catastrophe Losses and LAE | $ (1,473.0) | $ (1,337.9) | $ (1,103.2)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | (18.9) | 20.7 | 20.1
Catastrophe [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (180.4) | (95.8) | (60.5)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | 4.5 | 19.3 | 7.8
Catastrophe [Member] | Property and Casualty Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (174.0) | (90.4) | (56.6)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | 5.0 | 19.2 | 7.9
Catastrophe [Member] | Life and Health Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (6.4) | (5.4) | (3.9)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | (0.5) | $ 0.1 | $ (0.1)
Reinsurance Recoverable [Member] | Catastrophe [Member] | Property and Casualty Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (11.9) |  |
Reinsurance Recoverable FHCF [Member] | Catastrophe [Member] | Life and Health Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ (0.2) |  |

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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