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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 3 Months Ended 12 Months Ended
Sep. 18, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2019
USD ($)
reporting_units
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Product Information [Line Items]                                    
Number of reportable segments                         3 3        
Total lease liabilities   $ 486,300,000               $ 486,300,000 $ 486,300,000 $ 486,300,000 $ 486,300,000 $ 486,300,000        
Total operating lease right-of-use-assets     $ 436,800,000                           $ 235,979,000  
Retained earnings   2,333,011,000       $ 2,066,415,000       2,333,011,000 2,333,011,000 2,333,011,000 2,333,011,000 2,333,011,000 $ 2,066,415,000      
Other noncurrent assets   1,810,225,000       362,923,000       1,810,225,000 1,810,225,000 1,810,225,000 1,810,225,000 1,810,225,000 362,923,000      
Deferred income taxes   3,145,641,000       585,025,000       $ 3,145,641,000 3,145,641,000 $ 3,145,641,000 $ 3,145,641,000 $ 3,145,641,000 585,025,000      
Revenues   $ 1,987,760,000 $ 1,105,941,000 $ 935,152,000 $ 883,039,000 $ 880,555,000 $ 857,670,000 $ 833,164,000 $ 794,977,000   4,911,892,000       3,366,366,000 $ 3,975,163,000    
Cost of service                     2,073,803,000       1,095,014,000 1,928,037,000    
Selling, general and administrative expenses                     2,046,672,000       $ 1,534,297,000 $ 1,488,258,000    
Goodwill impairment                     0              
Buyout of relationship managers and sales managers commissions, fixed multiple period                   12 months                
Antidilutive securities excluded from computation of earnings per share (shares) | shares                       0     0 0    
Accounting Standards Update 2016-02                                    
Product Information [Line Items]                                    
Total lease liabilities                                 274,000,000.0  
Total operating lease right-of-use-assets                                 $ 236,000,000.0  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                                    
Product Information [Line Items]                                    
Retained earnings                                   $ 51,000,000.0
Other noncurrent assets                                   64,600,000
Deferred income taxes                                   $ 15,600,000
Revenues                     1,110,800,000              
Cost of service                     1,042,900,000              
Selling, general and administrative expenses                     $ 67,900,000              
Total System Services, Inc.                                    
Product Information [Line Items]                                    
Total purchase consideration $ 24,474,953,000                                  
Minimum                                    
Product Information [Line Items]                                    
Amortization period of capitalized contract costs   3 years               3 years 3 years 3 years 3 years 3 years        
Minimum | Internal-Use Software                                    
Product Information [Line Items]                                    
Estimated useful life                   2 years                
Maximum                                    
Product Information [Line Items]                                    
Amortization period of capitalized contract costs   7 years               7 years 7 years 7 years 7 years 7 years        
Maximum | Internal-Use Software                                    
Product Information [Line Items]                                    
Estimated useful life                   10 years