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Catastrophe Reinsurance - Catastrophe Losses and LAE (Details) - Catastrophe - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 60.1 | $ 87.6 | $ 180.4
Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 11.6 | 4.4 | 5.2
Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 44.6 | 79.1 | 168.8
Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | $ 3.9 | $ 4.1 | $ 6.4

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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=116884095&loc=d3e14764-158437 + Details
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