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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 50 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 15, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of discounts, premiums, and deferred debt issuance costs |  | $ 3,100,000 | $ 3,100,000 | $ 8,900,000 | $ 9,200,000 |  |  |
Proceeds from long-term debt |  |  |  | 1,868,199,000 | 6,704,838,000 |  |  |
Long-term debt |  | 9,268,462,000 |  | 9,268,462,000 |  |  |  | $ 9,125,501,000
Net repayments of settlement lines of credit |  |  |  | 31,069,000 | 144,473,000 |  |  |
Interest expense |  | 82,100,000 | $ 96,000,000.0 | 244,300,000 | $ 221,000,000.0 |  |  |
Interest rate swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) related to interest rate |  | 40,900,000 |  | 40,900,000 |  |  |  |
Line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 560,700,000 |  | 560,700,000 |  |  |  |
Remaining borrowing capacity |  | 1,387,300,000 |  | 1,387,300,000 |  |  |  |
Net repayments of settlement lines of credit |  |  |  | 58,500,000 |  |  |  |
Amount outstanding under lines of credit |  | 439,400,000 |  | $ 439,400,000 |  |  |  | $ 463,200,000
Average outstanding balance |  | $ 324,600,000 |  |  |  |  |  |
Weighted-average interest rate of short-term debt (as a percent) |  | 2.05% |  | 2.05% |  |  |  | 3.16%
Fourth Amendment | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Minimum leverage ratio |  | 3.50 |  | 3.50 |  |  |  |
Minimum interest coverage ratio |  | 3.00 |  | 3.00 |  |  |  |
Fourth Amendment | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee rate (as a percent) |  |  |  | 0.125% |  |  |  |
Fourth Amendment | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee rate (as a percent) |  |  |  | 0.30% |  |  |  |
Senior Notes and Term Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 49,400,000 |  | $ 49,400,000 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized discount |  | 8,700,000 |  | 8,700,000 |  |  |  |
Long-term debt |  | 7,100,000,000 |  | 7,100,000,000 |  |  |  |
Fair value of debt instrument |  | 7,700,000,000 |  | 7,700,000,000 |  |  |  |
Senior Notes | TSYS |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of discounts, premiums, and deferred debt issuance costs |  | 9,000,000.0 |  | 27,100,000 |  |  |  |
Senior Notes | Senior Unsecured Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount of debt instrument |  | $ 7,100,000,000 |  | $ 7,100,000,000 |  |  |  |
Senior Notes | 3.800% senior notes due April 1, 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.80% |  | 3.80% |  |  |  |
Senior Notes | 3.750% senior notes due June 1, 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.75% |  | 3.75% |  |  |  |
Senior Notes | 4.000% senior notes due June 1, 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 4.00% |  | 4.00% |  |  |  |
Senior Notes | 2.650% senior notes due February 15, 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 2.65% |  | 2.65% |  |  |  |
Senior Notes | 4.800% senior notes due April 1, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 4.80% |  | 4.80% |  |  |  |
Senior Notes | 4.450% senior notes due June 1, 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 4.45% |  | 4.45% |  |  |  |
Senior Notes | 3.200% senior notes due August 15, 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.20% |  | 3.20% |  |  |  |
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% |  | 2.90% |  |  |  |
Proceeds from long-term debt | $ 996,700,000 |  |  |  |  |  |  |
Debt issuance costs | $ 8,400,000 |  |  |  |  |  |  |
Senior Notes | 4.150% senior notes due August 15, 2049 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 4.15% |  | 4.15% |  |  |  |
Term Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  |  | $ 46,600,000
Term Loans | Term Loan A | Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Rate of quarterly installment payments (as a percent) |  |  |  |  |  | 2.50% |  |
Unsecured Debt | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 1.52% |  | 1.52% |  |  |  |
Unsecured Debt | Unsecured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 14,700,000 |  | $ 14,700,000 |  |  |  |
Unsecured Debt | Five Year Senior Unsecured Credit Facility | Term Loan Facility | Federal Funds Effective Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 0.50% |  |  |  |
Unsecured Debt | Five Year Senior Unsecured Credit Facility | Term Loan Facility | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.00% |  |  |  |
Unsecured Debt | Five Year Senior Unsecured Credit Facility | Forecast | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  | $ 2,000,000,000 |
Unsecured Debt | Five Year Senior Unsecured Credit Facility | Forecast | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  | $ 3,000,000,000 |
Line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  |  | $ 17,600,000
Line of credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Remaining borrowing capacity |  | 2,100,000,000 |  | $ 2,100,000,000 |  |  |  |
Outstanding borrowings under the credit facility |  | 0 |  | 0 |  |  |  |
Line of credit | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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