XML 115 R70.htm IDEA: XBRL DOCUMENT v3.24.0.1
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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 712.4 $ 1,222.0    
Restricted cash and cash equivalents 251.7 185.9    
Total cash, cash equivalents and restricted cash 964.1 1,407.9 $ 476.0 $ 1,238.5
Restricted investments securing reinsurance contracts and letter of credit facilities 1,347.0 989.4    
Total cash, cash equivalents, restricted cash and restricted investments 2,311.1 2,397.3    
Financial Standby Letter of Credit        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents 5.8 21.2    
Reinsurance Contracts        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and cash equivalents $ 245.9 $ 164.7