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Subsequent Events (Narrative) (Details) - USD ($)
Jun. 01, 2020
May 01, 2020
Apr. 21, 2020
Mar. 10, 2020
Feb. 28, 2017
Subsequent Event [Line Items]          
Purchace price       $ 4,035,743,000  
Senior Notes [Member]          
Subsequent Event [Line Items]          
Debt instrument, face amount         $ 1,000,000,000
Stated interest rate         5.75%
Subsequent Event [Member] | Connected Analytics [Member]          
Subsequent Event [Line Items]          
Consideration   $ 55,000,000      
Subsequent Event [Member] | eRx Network [Member]          
Subsequent Event [Line Items]          
Ownership interest purchased   100.00%      
Purchace price   $ 212,900,000      
Subsequent Event [Member] | PDX, Inc. [Member]          
Subsequent Event [Line Items]          
Ownership interest purchased 100.00%        
Purchace price $ 208,000,000        
Subsequent Event [Member] | Unsecured Senior Notes Due 2025 [Member]          
Subsequent Event [Line Items]          
Debt instrument, face amount     $ 325,000,000    
Stated interest rate     5.75%    
Percentage of debt principal amount     100.00%    
Maturity date     Dec. 31, 2025    
Subsequent Event [Member] | Seller Note [Member] | Connected Analytics [Member]          
Subsequent Event [Line Items]          
Debt instrument, face amount   $ 25,000,000