VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at End of Period	$ 37.1
Allowance for doubtful accounts receivable
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	51.1	$ 66.6	$ 93.0
Charged to Costs and Expenses	62.4	78.3	115.4
Charged to Revenue	0.0	0.0	0.0
Deductions	(76.4)	(93.8)	(141.8)
Balance at End of Period		51.1	66.6
Refund liability
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	9.1
Charged to Costs and Expenses	0.0
Charged to Revenue	75.9
Deductions	(80.7)
Balance at End of Period	4.3	9.1
Refund liability
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	9.1	10.7	12.3
Charged to Costs and Expenses		0.0	0.0
Charged to Revenue		101.4	132.6
Deductions		(103.0)	(134.2)
Balance at End of Period		9.1	10.7
Allowance for inventory obsolescence
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	70.4	82.0	146.1
Charged to Costs and Expenses	26.8	37.9	37.1
Charged to Revenue	0.0	0.0	0.0
Deductions	(42.4)	(49.5)	(101.2)
Balance at End of Period	54.8	70.4	82.0
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	2,327.6	2,960.0	3,257.5
Charged to Costs and Expenses	125.7	(632.4)	(297.5)
Charged to Revenue	0.0	0.0	0.0
Deductions	(1,637.9)	0.0	0.0
Balance at End of Period	$ 815.4	$ 2,327.6	$ 2,960.0