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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 50 Months Ended | 62 Months Ended | 68 Months Ended | 71 Months Ended | 101 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 25, 2019 $ / shares | May 27, 2019 USD ($) | Jun. 30, 2019 USD ($) Rate | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) $ / shares Rate | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2022 | Mar. 31, 2023 | Sep. 30, 2025 | Jul. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019 USD ($) | Jul. 09, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per quarter (USD per share) | $ / shares |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | $ 65,500,000 | $ 48,100,000 | $ 123,900,000 | $ 93,500,000 |  |  |  |  |  |  |  |  |  |
Unsecured Debt | Bridge Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | $ 2,750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period of credit facility |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  | $ 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance fees |  |  | 2,900,000 |  | 2,900,000 |  |  |  |  |  |  |  |  |  |  |
Unamortized portion of debt issuance fees |  |  | 8,800,000 |  | 8,800,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan | Term Loan A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility interest rate (as a percent) | Rate |  |  | 3.90% |  | 3.90% |  |  |  |  |  |  |  |  |  |  |
Term Loan | Term Loan A-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 1,370,000,000 |  | $ 1,370,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility interest rate (as a percent) | Rate |  |  | 3.90% |  | 3.90% |  |  |  |  |  |  |  |  |  |  |
Term Loan | Term Loan B-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 1,140,000,000 |  | $ 1,140,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility interest rate (as a percent) | Rate |  |  | 4.15% |  | 4.15% |  |  |  |  |  |  |  |  |  |  |
Term Loan | Term Loan B-4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility interest rate (as a percent) | Rate |  |  | 4.15% |  | 4.15% |  |  |  |  |  |  |  |  |  |  |
Term Loan | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  | 628,100,000 |  | 628,100,000 |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 873,000,000.0 |  | 873,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Net repayments of settlement lines of credit |  |  |  |  | 68,900,000 |  | $ 70,600,000 |  |  |  |  |  |  |  |  |
Amount outstanding under lines of credit |  |  | $ 736,200,000 |  | $ 736,200,000 |  | $ 700,500,000 |  |  |  |  |  |  |  |  |
Weighted-average interest rate of short-term debt (as a percent) |  |  | 3.01% |  | 3.01% |  | 2.97% |  |  |  |  |  |  |  |  |
Average outstanding balance |  |  | $ 440,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) related to interest rate |  |  | $ 9,700,000 |  | $ 9,700,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per quarter (USD per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Unsecured Debt | Bridge Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000,000
Forecast | Unsecured Debt and Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000,000 |
Forecast | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000,000 |
Forecast | Term Loan | Term Loan A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of quarterly installment payments (as a percent) |  |  |  |  |  |  |  | 1.25% | 1.875% | 2.50% |  |  |  |  |  |
Forecast | Term Loan | Term Loan B-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of quarterly installment payments (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |
Forecast | Term Loan | Term Loan B-4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of quarterly installment payments (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |
Term Loan Facility | Forecast | Unsecured Debt | Five Year Senior Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000.0 |
Uncommitted incremental term loan capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |
Revolving Credit Facility | Fourth Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  | 5.00 |  | 5.00 |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  |  | 3.25 |  | 3.25 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) | Rate |  |  | 3.89% |  | 3.89% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Forecast | Fourth Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  | 4.50 | 4.75 |  |
Revolving Credit Facility | Forecast | Unsecured Debt | Five Year Senior Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000.0 |
Letter of Credit | Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit | Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  | 723,200,000 |  | $ 723,200,000 |  |  |  |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | Fourth Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee rate (as a percent) |  |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | Fourth Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee rate (as a percent) |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | Forward-starting interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued liabilities | Interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 1,000,000,000 |  | $ 1,000,000,000 |  | $ 0 |  |  |  |  |  |  |  |  |

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