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Statutory Requirements and Dividends Restrictions - Summary of Statutory Requirements and Dividends Restrictions (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
U.S.    
Required statutory capital and surplus $ 561.2 $ 504.8
Actual statutory capital and surplus 889.7 606.2
Bermuda    
Required statutory capital and surplus 683.7 632.5
Actual statutory capital and surplus 1,141.0 1,147.5
U.K.    
Required statutory capital and surplus 800.7 786.0
Actual statutory capital and surplus $ 963.6 $ 969.5