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Reinsurance and Catastrophes - Total Amounts of Reinsurance Recoverables On Unpaid Insurance Reserves (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Summary of reinsurance recoverable on unpaid insurance reserves |  |  |  |
Reinsurance recoverables | $ 119.6 | $ 122.5 |  |
Property & Casualty |  |  |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |  |  |
Reinsurance recoverables | 110.3 | 112.9 | $ 120.5 | $ 89.7
Property & Casualty | Reinsurance companies |  |  |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |  |  |
Reinsurance recoverables | 10.4 | 13.2 |  |
Property & Casualty | State insurance facilities |  |  |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |  |  |
Reinsurance recoverables | 99.9 | 99.7 |  |
Life |  |  |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |  |  |
Reinsurance recoverables | $ 9.3 | $ 9.6 |  |

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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