Description of Business and Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) $ in Millions	Dec. 31, 2023 USD ($) state	Dec. 31, 2022 USD ($) state
Accounting Policies [Abstract]
Restricted cash pledged as collateral	$ 28.3	$ 5.1
Restricted cash pledged against obligations to policyholders and creditors	1.3	1.0
Restricted funds held for payment of possible warranty claims	$ 7.3	$ 5.0
Number of states regulatory guidelines of warranty claims | state	19	19
Indemnification hold back cost	$ 1.9	$ 2.4