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Fair Value Measurements - Contingent Consideration (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 29, 2016
Jan. 31, 2020
Mar. 31, 2020
Jun. 30, 2020
Jul. 29, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Payment for Contingent Consideration Liability, Operating Activities   $ 10.0        
Contingent Consideration Commission payable     $ 0.0      
Lattice            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration $ 60.0          
Contingent Consideration Payment Period 4 years          
Other revenues     (11.9)      
Lattice | Contingent Obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate       10.00%    
AUM Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Business Combination,Contingent Consideration, Liability, Measurement Input Amount     $ 2,300.0     $ 3,000.0
Subsequent Event [Member] | Lattice            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Contingent Consideration Commission payable         $ 0.0