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Description of Business and Summary of Significant Accounting Policies - Allowance, Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Allowance for uncollectible receivables | $ 0.5 | $ 0.4
Deferred policy acquisition costs | 8.7 | 4.0
Amortized deferred acquisition costs | $ 14.5 | $ 2.5

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