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Reinsurance
3 Months Ended
Mar. 31, 2021
Insurance [Abstract]  
Summary of Reinsurance Activity
A summary of reinsurance activity is as follows:
(In millions)For the Three Months Ended 
March 31,
 20212020
Net assumed written premiums$18.7 $17.3 
Net premiums earned14.4 12.9 
Provision for claims9.0 8.8 
Amortization of capitalized acquisition costs0.4 0.4 
Schedule of Trust Assets and Reinsurance Liabilities
The trust assets and related reinsurance liabilities are as follows:
(In millions) As of
 Balance Sheet locationMarch 31, 2021December 31, 2020
Trust assetsRestricted cash and cash equivalents$0.5 $0.7 
Trust assetsRestricted securities available for sale68.1 66.1 
Unearned premiumAccounts payable and accrued liabilities52.8 48.5 
Claims reserve (1)Accounts payable and accrued liabilities2.3 2.3 

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