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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 50 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 27, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2021 | Dec. 31, 2019 USD ($) | Sep. 18, 2019 USD ($) | Aug. 14, 2019 USD ($) | Jul. 09, 2019 USD ($) | Jun. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of discounts, premiums, and deferred debt issuance costs |  | $ 3,100,000 | $ 2,900,000 | $ 9,200,000 | $ 8,600,000 |  |  |  |  |  |  |
Interest expense |  | 96,000,000 | $ 46,000,000 | 221,000,000 | $ 140,000,000 |  |  |  |  |  |  |
Write-off of unamortized debt issuance sost |  | 16,700,000 |  | 16,700,000 |  |  |  |  |  |  |  |
Forward-starting interest rate swap |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative settlement payments |  |  |  | 48,300,000 |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) related to interest rate |  | 19,100,000 |  | 19,100,000 |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | Forward-starting interest rate swap |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0
Line of credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 699,000,000.0 |  | 699,000,000.0 |  |  |  |  |  |  |  |
Remaining borrowing capacity |  | 871,900,000 |  | 871,900,000 |  |  |  |  |  |  |  |
Net repayments of settlement lines of credit |  |  |  | 72,100,000 |  | $ 70,600,000 |  |  |  |  |  |
Amount outstanding under lines of credit |  | $ 547,600,000 |  | $ 547,600,000 |  | $ 700,500,000 |  |  |  |  |  |
Weighted-average interest rate of short-term debt (as a percent) |  | 3.34% |  | 3.34% |  | 2.97% |  |  |  |  |  |
Average outstanding balance |  | $ 426,600,000 |  |  |  |  |  |  |  |  |  |
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 |  | $ 48,000,000.0 |  | $ 48,000,000.0 |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  | 6,000,000.0 |  | 6,000,000.0 |  |  |  |  |  |  |  |
Fair value of debt instrument |  | 6,313,200,000 |  | 6,313,200,000 |  |  |  |  |  |  |  |
Senior Notes | TSYS |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of discounts, premiums, and deferred debt issuance costs |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |  |  |  |  |
Fair value of debt instrument |  |  |  |  |  |  |  |  | $ 3,200,000,000 |  |  |
Unamortized premium |  |  |  |  |  |  |  |  | 169,000,000.0 |  |  |
Senior Notes | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  | $ 3,000,000,000.0 |  |
Senior Notes | Senior Unsecured Notes | TSYS |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  | 3,000,000,000.0 |  |  |
Senior Notes | 3.800% senior notes due April 1, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  | 750,000,000 |  |  |
Stated interest rate (as a percent) |  | 3.80% |  | 3.80% |  |  |  |  |  |  |  |
Senior Notes | 3.750% senior notes due June 1, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  | 550,000,000 |  |  |
Stated interest rate (as a percent) |  | 3.75% |  | 3.75% |  |  |  |  |  |  |  |
Senior Notes | 4.000% senior notes due June 1, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  | 550,000,000 |  |  |
Stated interest rate (as a percent) |  | 4.00% |  | 4.00% |  |  |  |  |  |  |  |
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% |  | 2.65% |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
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% |  | 3.20% |  |  |  |  |  |  |  |
Senior Notes | 4.150% senior notes due August 15, 2049 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
Stated interest rate (as a percent) |  | 4.15% |  | 4.15% |  |  |  |  |  |  |  |
Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | $ 37,400,000 |  |  |  |  |  |
Term Loans | Term Loan A |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Term Loans | Term Loan A | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rate of quarterly installment payments (as a percent) |  |  |  |  |  |  | 2.50% |  |  |  |  |
Term Loans | Term Loan A-2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | 1,370,000,000 |  | 1,370,000,000 |  |  |  |  |  |  |  |
Term Loans | Term Loan B-2 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  | 6,100,000 |  | 6,100,000 |  |  |  |  |  |  |  |
Face amount of debt instrument |  | 1,140,000,000 |  | 1,140,000,000 |  |  |  |  |  |  |  |
Capitalized debt issuance costs |  | 29,300,000 |  | 29,300,000 |  |  |  |  |  |  |  |
Term Loans | Term Loan B-4 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | 500,000,000 |  | 500,000,000 |  |  |  |  |  |  |  |
Term Loans | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Unsecured Debt | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 3.42% |  | 3.42% |  |  |  |  |  |  |  |
Unsecured Debt | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 3.33% |  | 3.33% |  |  |  |  |  |  |  |
Unsecured Debt | Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 18,600,000 |  | $ 18,600,000 |  |  |  |  |  |  |  |
Unsecured Debt | Bridge Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument | $ 2,750,000,000 | 0 |  | 0 |  |  |  |  |  |  | $ 2,100,000,000 |
Expiration period of credit facility | 364 days |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | 8,800,000 |  | $ 11,700,000 |  |  |  |  |  |  |  |
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 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalized debt issuance costs |  | 12,800,000 |  | $ 12,800,000 |  |  |  |  |  |  |  |
Unsecured Debt | Five Year Senior Unsecured Credit Facility | Forecast | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  |
Unsecured Debt | Five Year Senior Unsecured Credit Facility | Forecast | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  | $ 3,000,000,000.0 |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | $ 12,900,000 |  |  |  |  |  |
Line of credit | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 250,000,000 |  | 250,000,000 |  |  |  |  |  |  |  |
Line of credit | Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  | $ 2,198,800,000 |  | $ 2,198,800,000 |  |  |  |  |  |  |  |

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