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SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |
Cash and cash equivalents | $ 1,109,100,000 | $ 404,900,000
Debt instrument, covenant, operating income excluding depreciation and amortization to interest expense, minimum | 3.0 |
Deferred revenue | $ 25,700,000 |
Line of Credit | 2018 Revolving Credit Facility |  |
Significant Accounting Policies [Line Items] |  |
Maximum borrowing capacity | 700,000,000.0 |
Line of Credit | Various Credit Facilities |  |
Significant Accounting Policies [Line Items] |  |
Maximum borrowing capacity | 400,000,000.0 |
Trade Accounts Receivable |  |
Significant Accounting Policies [Line Items] |  |
Allowance for doubtful accounts and trade discounts | $ 37,400,000 | $ 29,400,000

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