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Catastrophe Reinsurance - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophic events classification by amount | $ 25,000,000 |  |
Ceded earned premiums | 36,100,000 | $ 31,200,000 | $ 27,400,000
Incurred losses and LAE related to prior year (favorable) adverse development | 106,700,000 | 36,400,000 | (71,100,000)
Catastrophe |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 102,400,000 | 106,900,000 | 60,100,000
Incurred losses and LAE related to prior year (favorable) adverse development | (5,400,000) | 200,000 | (17,100,000)
Catastrophe | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 12,900,000 | 12,900,000 | 3,900,000
Incurred losses and LAE related to prior year (favorable) adverse development | (100,000) | 500,000 | 800,000
Catastrophe | Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 16,000,000.0 | 12,500,000 | 11,600,000
Incurred losses and LAE related to prior year (favorable) adverse development | 300,000 | 200,000 | 500,000
Catastrophe | Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Catastrophe Losses and LAE | 73,500,000 | 81,500,000 | 44,600,000
Incurred losses and LAE related to prior year (favorable) adverse development | (5,600,000) | (500,000) | (18,400,000)
Catastrophe Reinsurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 30,300,000 | 26,700,000 | 20,500,000
Catastrophe Reinsurance | Life & Health Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 1,300,000 | 1,200,000 | 100,000
Catastrophe Reinsurance | Specialty Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | 7,000,000.0 | 4,800,000 | 200,000
Catastrophe Reinsurance | Preferred Property & Casualty Insurance |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Ceded earned premiums | $ 22,000,000.0 | $ 20,700,000 | $ 20,200,000

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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: 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 C)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 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=120400993&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 (c)(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 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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