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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers out of Level 3 $ 0.0 $ 2.7 $ 1.6 $ 69.5
Transfers from Level 3 to Level 2       7.7
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 $ 145.3   $ 145.3  
Equity Securities at Modified Cost        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers out of Level 3       $ 61.8