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Catastrophe Reinsurance - Catastrophe Losses and LAE (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ (2,086.0) | $ (1,473.0) | $ (1,337.9)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | 7.4 | (18.9) | 20.7
Catastrophe [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (87.6) | (180.4) | (95.8)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | 8.4 | 4.5 | 19.3
Catastrophe [Member] | Property and Casualty Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (79.1) | (168.8) | (84.1)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | 8.2 | 4.7 | 19.0
Catastrophe [Member] | Specialty Property & Casualty Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (4.4) | (5.2) | (6.3)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | 0.3 | 0.3 | 0.2
Catastrophe [Member] | Life and Health Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (4.1) | (6.4) | (5.4)
Catastrophe Loss and LAE Reserves, (Unfavorable) Favorable Development | (0.1) | (0.5) | $ 0.1
Reinsurance Recoverable FHCF [Member] | Catastrophe [Member] | Property and Casualty Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | (31.8) | (11.9) |
Reinsurance Recoverable FHCF [Member] | Catastrophe [Member] | Life and Health Insurance [Member] |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ (1.6) | $ (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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