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Investments - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 15, 2020
Mar. 18, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 06, 2020
Debt Securities, Available-for-sale [Line Items]                
Equity investment $ 289,000,000.0              
Investment in Equity Fund, prepaid expense     $ 64,400,000 $ 75,100,000   $ 75,100,000    
Corporate debt securities, with maturity of less than one year       34,000,000.0   34,000,000.0    
Corporate debt securities, with maturity of more than one year and less than five years       500,000   500,000    
Other-than-temporary impairment charges related to corporate debt securities       0 $ 0 0 $ 400,000  
Corporate debt securities                
Debt Securities, Available-for-sale [Line Items]                
Debt securities held with previously recognized other than temporary impairment       15,700,000   15,700,000    
Dun And Bradstreet Corporation                
Debt Securities, Available-for-sale [Line Items]                
Aggregate value of ownership based on quoted market price       $ 2,000,000,000.0   $ 2,000,000,000.0    
Ownership percentage       18.10%   18.10%   18.10%
Equity investment           $ 200,000,000.0 $ 526,200,000  
Dun And Bradstreet Corporation | Equity Sponsors                
Debt Securities, Available-for-sale [Line Items]                
Collective voting interest with other equity sponsors (greater than)       50.00%   50.00%    
Senator Focused Strategies                
Debt Securities, Available-for-sale [Line Items]                
Ownership percentage     49.00% 87.40%   87.40%    
Equity investment     $ 90,900,000     $ 201,200,000    
Senator Focused Strategies | Funds Held on Deposit with Equity Fund                
Debt Securities, Available-for-sale [Line Items]                
Investment in Equity Fund, prepaid expense       $ 25,800,000   $ 25,800,000    
AmeriLife                
Debt Securities, Available-for-sale [Line Items]                
Ownership percentage   20.30%   20.30%   20.30%    
Equity investment   $ 125,000,000.0            
QOMPLX                
Debt Securities, Available-for-sale [Line Items]                
Investment without readily determinable fair value       $ 30,000,000.0   $ 30,000,000.0    
Ceridian                
Debt Securities, Available-for-sale [Line Items]                
Ownership percentage       10.90%   10.90%