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Commitments and Contingent Liabilities - Schedule of Company's Restricted Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Restricted assets $ 4,526.4 $ 4,638.8
Total as percent of investable assets(2) 56.00% 53.40%
Securities and cash as collateral secured letters of credit $ 840.3 $ 658.5
Letters of credit / guarantees    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Restricted assets 840.3 658.5
Affiliated transactions    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Restricted assets 1,154.5 1,455.0
Third party    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Restricted assets 2,431.1 2,425.3
Limited Partner | Real estate funds    
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]    
Restricted assets 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 $ 100.5 $ 0.0