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Total Cash, Cash Equivalents, Restricted Cash and Restricted Investments - Summary of Cash and Cash Equivalents, Restricted Cash and Restricted Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restricted Cash and Cash Equivalent Item [Line Items]        
Cash and cash equivalents $ 873.0 $ 743.0    
Restricted cash and cash equivalents 374.6 203.6    
Total cash, cash equivalents and restricted cash 1,247.6 946.6 $ 964.1 $ 1,407.9
Restricted investments securing reinsurance contracts and letter of credit facilities 850.7 1,328.7    
Total cash, cash equivalents, restricted cash and restricted investments 2,098.3 2,275.3    
Financial Standby Letter of Credit        
Restricted Cash and Cash Equivalent Item [Line Items]        
Restricted cash and cash equivalents 21.5 51.6    
Reinsurance Contracts        
Restricted Cash and Cash Equivalent Item [Line Items]        
Restricted cash and cash equivalents $ 353.1 $ 152.0