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