SUPPLEMENTAL BALANCE SHEET INFORMATION - Components of Prepaid Expenses and Other (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid taxes and tax refunds receivable	$ 83.4	$ 117.6
Receivables other than trade	27.6	34.9
Prepaid brochure costs, paper and other literature	9.7	12.0
Other	42.2	39.7
Prepaid expenses and other	$ 162.9	$ 204.2