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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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