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Reinsurance
 6 Months Ended
Jun. 30, 2022
Insurance [Abstract]  
Summary of Reinsurance Activity
A summary of reinsurance activity is as follows:
(In millions)For the Three Months Ended 
June 30,		For the Six Months Ended 
June 30,
 2022202120222021
Net assumed written premiums$19.1 $15.1 $36.8 $33.8 
Net premiums earned15.4 15.8 29.2 30.2 
Provision for claims12.2 10.3 21.1 19.3 
Amortization of capitalized acquisition costs0.4 0.4 0.8 0.8 
Schedule of Trust Assets and Reinsurance Liabilities
The trust assets and related reinsurance liabilities are as follows:
(In millions) As of
 Balance Sheet locationJune 30, 2022December 31, 2021
Trust assetsRestricted cash and cash equivalents$1.0 $0.3 
Trust assetsRestricted securities available for sale66.0 62.1 
Unearned premiumAccounts payable and accrued liabilities52.2 44.6 
Claims reserve (1)Accounts payable and accrued liabilities2.9 2.4 

(1)    The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.