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Commitments and Contingencies - Schedule of Company's Restricted Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Dec. 20, 2017
Fair Value, Separate Account Investment [Line Items]        
Restricted assets, excluding illiquid assets $ 4,530.8 $ 4,306.9    
Other investments, at fair value 151.3 109.4    
Total restricted assets $ 4,682.1 $ 4,416.3    
Total as percent of investable assets 59.70% 58.60%    
Securities and cash as collateral secured letters of credit $ 539.8 $ 516.8    
Affiliated transactions        
Fair Value, Separate Account Investment [Line Items]        
Restricted Assets 891.3 1,027.9    
Third party        
Fair Value, Separate Account Investment [Line Items]        
Restricted Assets 3,099.7 2,762.2    
Letters of credit / guarantees        
Fair Value, Separate Account Investment [Line Items]        
Restricted Assets 539.8 516.8    
Limited Partner | Real estate fund        
Fair Value, Separate Account Investment [Line Items]        
Restricted Assets     $ 20.0 $ 100.0
Other investments, at fair value $ 151.3 $ 109.4