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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers out of Level 3 $ 1,600,000 $ 0 $ 1,600,000 $ 66,800,000
Transfers from Level 3 to Level 2       (5,000,000.0)
Limited Liability Companies and Limited Partnerships | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unfunded commitments $ 151,600,000   $ 151,600,000  
Equity Securities at Modified Cost        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers out of Level 3       $ 61,800,000