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Investment Securities - Other long-term investments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments $ 1,032.2 $ 786.8
Asset Management (Kudu)    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 427.4 400.6
PassportCard/DavidShield    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 95.0 95.0
Elementum Holdings L.P.    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 56.7 55.1
Other unconsolidated entities    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 43.3 42.4
Total unconsolidated entities    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 622.4 593.1
Private equity funds and hedge funds    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 133.5 121.2
Lloyd’s trust deposits    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 99.2 0.0
Bank loan fund    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 89.2 0.0
ILS funds    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 53.8 51.4
Private debt instruments    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments 21.0 21.1
Other    
Debt and Equity Securities, FV-NI [Line Items]    
Other Long-term Investments $ 13.1 $ 0.0