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Commitments and Contingent Liabilities - Schedule of Company's Restricted Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Dec. 20, 2017
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Restricted assets $ 4,564.6 $ 4,419.2  
Total as percent of investable assets(2) 58.50% 56.40%  
Securities and cash as collateral secured letters of credit $ 792.4 $ 771.1  
Letters of credit / guarantees      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Restricted assets 792.4 771.1  
Affiliated transactions      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Restricted assets 922.5 1,033.9  
Third party      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Restricted assets 2,745.7 2,511.7  
Limited Partner | Real estate funds      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Restricted assets 0.0 0.0 $ 100.0
Purchase Commitment | Limited Partner | Real estate funds      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Restricted assets $ 104.0 $ 102.5