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Cash, cash equivalents, restricted cash and restricted investments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 999.8 $ 526.0    
Restricted cash 948.6 1,187.9    
Total cash, cash equivalents and restricted cash 1,948.4 1,713.9 $ 1,654.0 $ 713.4
Restricted investments securing reinsurance contracts 1,107.0 86.4    
Total cash, cash equivalents, restricted cash and restricted investments 3,055.4 1,800.3    
Managing general underwriters        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 16.6 0.0    
Letter of credit facilities        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash 500.2 306.0    
Reinsurance contracts        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 431.8 $ 881.9