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Investments (excluding Consolidated Investment Entities) - Troubled Debt Restructuring (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
loan
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0
Private placement    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring contracts 1 0
Pre-modification carrying value | $ $ 22.0  
Post-modification carrying value | $ $ 22.0  
Commercial mortgage loans    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring contracts 0 0