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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details)			12 Months Ended			50 Months Ended
	May 15, 2020 USD ($)	May 27, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2021	Sep. 30, 2020	Sep. 18, 2019 USD ($)	Aug. 14, 2019 USD ($)	Jul. 09, 2019 USD ($)	Jun. 30, 2019 USD ($)	Oct. 18, 2018 USD ($)
Debt Instrument [Line Items]
Amortization of discounts, premiums, and deferred debt issuance costs			$ 12,000,000.0	$ 11,900,000	$ 11,700,000
Proceeds from long-term debt			2,401,147,000	7,203,903,000	2,774,214,000
Write-off of unamortized debt issuance sost				16,700,000
Interest expense			326,800,000	301,200,000	$ 195,500,000
Senior Notes
Debt Instrument [Line Items]
Unamortized discount			8,500,000	5,900,000
Long-term debt			7,100,000,000
Fair value of debt instrument			7,800,000,000
Senior Notes | Senior Unsecured Notes
Debt Instrument [Line Items]
Face amount of debt instrument			$ 7,100,000,000						$ 3,000,000,000.0
Senior Notes | 2.900% senior notes due May 15, 2030
Debt Instrument [Line Items]
Face amount of debt instrument	$ 1,000,000,000.0
Stated interest rate (as a percent)	2.90%		2.90%
Proceeds from long-term debt	$ 996,700,000
Capitalized debt issuance costs	$ 8,400,000
Gross long-term debt			$ 989,025,000	0
Senior Notes | 2.650% senior notes due February 15, 2025
Debt Instrument [Line Items]
Face amount of debt instrument									1,000,000,000.0
Stated interest rate (as a percent)			2.65%
Gross long-term debt			$ 993,110,000	991,423,000
Senior Notes | 3.200% senior notes due August 15, 2029
Debt Instrument [Line Items]
Face amount of debt instrument									1,250,000,000
Stated interest rate (as a percent)			3.20%
Gross long-term debt			$ 1,236,424,000	1,234,843,000
Senior Notes | 4.150% senior notes due August 15, 2049
Debt Instrument [Line Items]
Face amount of debt instrument									$ 750,000,000.0
Stated interest rate (as a percent)			4.15%
Gross long-term debt			$ 739,789,000	739,431,000
Senior Notes | 3.800% senior notes due April 1, 2021
Debt Instrument [Line Items]
Face amount of debt instrument								$ 750,000,000.0
Stated interest rate (as a percent)			3.80%					3.80%
Gross long-term debt			$ 752,199,000	760,996,000
Senior Notes | 3.750% senior notes due June 1, 2023
Debt Instrument [Line Items]
Face amount of debt instrument								$ 550,000,000.0
Stated interest rate (as a percent)			3.75%					3.75%
Gross long-term debt			$ 562,258,000	567,330,000
Senior Notes | 4.000% senior notes due June 1, 2023
Debt Instrument [Line Items]
Face amount of debt instrument								$ 550,000,000.0
Stated interest rate (as a percent)			4.00%					4.00%
Gross long-term debt			$ 565,930,000	572,522,000
Senior Notes | 4.800% senior notes due April 1, 2026
Debt Instrument [Line Items]
Face amount of debt instrument								$ 750,000,000
Stated interest rate (as a percent)			4.80%					4.80%
Gross long-term debt			$ 809,324,000	820,623,000
Senior Notes | 4.450% senior notes due June 1, 2028
Debt Instrument [Line Items]
Face amount of debt instrument								$ 450,000,000
Stated interest rate (as a percent)			4.45%					4.45%
Gross long-term debt			$ 482,588,000	486,982,000
Senior Notes and Secured Debt
Debt Instrument [Line Items]
Unamortized debt issuance costs			47,400,000
Secured Debt
Debt Instrument [Line Items]
Unamortized debt issuance costs				46,600,000
Secured Debt | Term Loan A
Debt Instrument [Line Items]
Face amount of debt instrument			1,500,000,000
Secured Debt | Term Loan A-2
Debt Instrument [Line Items]
Face amount of debt instrument			1,370,000,000
Secured Debt | Term Loan B-2
Debt Instrument [Line Items]
Unamortized discount			6,100,000
Face amount of debt instrument			1,140,000,000
Capitalized debt issuance costs			29,600,000
Secured Debt | Term Loan B-4
Debt Instrument [Line Items]
Face amount of debt instrument												$ 500,000,000.0
Line of Credit
Debt Instrument [Line Items]
Unamortized debt issuance costs				17,600,000
Unsecured Debt | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs			13,800,000
Unsecured Debt | Bridge Facility
Debt Instrument [Line Items]
Face amount of debt instrument		$ 2,750,000,000	0							$ 2,100,000,000
Expiration period of credit facility		364 days
Interest expense				11,700,000
Unsecured term loan facility
Debt Instrument [Line Items]
Gross long-term debt			1,985,776,000	1,981,758,000
Forward-Starting Interest Rate Swap
Debt Instrument [Line Items]
Derivative settlement payments				48,300,000
Interest Rate Swap
Debt Instrument [Line Items]
Reclassification of net unrealized losses (gains) on hedging activities to interest expense			39,800,000
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			752,500,000
Available borrowings under credit facility			1,507,600,000
Repayments of lines of credit			64,500,000	74,500,000
Amount outstanding under lines of credit			358,700,000
Average outstanding balance			$ 341,400,000
Weighted-average interest rate of short-term debt (as a percent)			2.35%
Forecast | Secured Debt | Term Loan A
Debt Instrument [Line Items]
Rate of quarterly installment payments (as a percent)						2.50%
Term Loan Facility | Unsecured Debt
Debt Instrument [Line Items]
Effective interest rate (as a percent)			1.52%
Term Loan Facility | Unsecured Debt | Five Year Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Face amount of debt instrument			$ 2,000,000,000.0
Revolving Credit Facility | Fourth Amendment
Debt Instrument [Line Items]
Minimum leverage ratio			3.50
Minimum interest coverage ratio							3.00
Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Face amount of debt instrument			$ 1,500,000,000
Revolving Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Effective interest rate (as a percent)			1.48%
Revolving Credit Facility | Unsecured Debt | Five Year Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Face amount of debt instrument			$ 3,000,000,000.0
Capitalized debt issuance costs			12,800,000
Letter of Credit | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			250,000,000
Standby Letters of Credit | Line of Credit
Debt Instrument [Line Items]
Available borrowings under credit facility			$ 2,100,000,000
Minimum | Revolving Credit Facility | Fourth Amendment
Debt Instrument [Line Items]
Commitment fee (as a percent)			0.125%
Maximum | Revolving Credit Facility | Fourth Amendment
Debt Instrument [Line Items]
Commitment fee (as a percent)			0.30%
Fed Funds Effective Rate Overnight Index Swap Rate | Term Loan Facility | Unsecured Debt | Five Year Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			0.50%
London Interbank Offered Rate (LIBOR) | Term Loan Facility | Unsecured Debt | Five Year Senior Unsecured Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.00%
Total System Services, Inc. | Senior Notes
Debt Instrument [Line Items]
Amortization of discounts, premiums, and deferred debt issuance costs			$ 36,200,000	$ 10,500,000
Total System Services, Inc. | Senior Notes | Senior Unsecured Notes
Debt Instrument [Line Items]
Face amount of debt instrument								$ 3,000,000,000.0
Other noncurrent liabilities | Forward-Starting Interest Rate Swap
Debt Instrument [Line Items]
Notional amount											$ 1,000,000,000.0

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