ACCOUNTS AND OTHER RECEIVABLES - Components of Accounts and Other Receivables - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 682.5	$ 634.2
Bedding Products
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	22.2	22.5
Trade Accounts Receivable | Bedding Products
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	0.4	0.5
Notes Receivable | Bedding Products
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 21.8	$ 22.0