RESTRUCTURING AND OTHER COSTS - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended			5 Months Ended	6 Months Ended
	Aug. 06, 2020	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred cost		$ (1.3)	$ (42.4)			$ (43.8)	$ (62.9)
Indefinite-lived intangible asset impairment						38.7	5.3
Net restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred cost		(2.2)	(10.7)			(4.5)	(24.9)
Other Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred cost		0.9	$ (31.7)			(39.3)	$ (38.0)
Asset impairment						$ 38.7
Technologies & Equipment
Restructuring Cost and Reserve [Line Items]
Indefinite-lived intangible asset impairment		$ 32.8		$ 5.3
Technologies And Equipment And Consumables Segments | Minimum | Traditional Orthodontics Business And Portions Of Laboratory Business | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, settled without cash					$ 45.0
Technologies And Equipment And Consumables Segments | Minimum | Subsequent event | Traditional Orthodontics Business And Portions Of Laboratory Business
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated, period percent	4.00%
Restructuring and related cost, expected cost	$ 80.0
Technologies And Equipment And Consumables Segments | Maximum | Traditional Orthodontics Business And Portions Of Laboratory Business | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, settled without cash					$ 55.0
Technologies And Equipment And Consumables Segments | Maximum | Subsequent event | Traditional Orthodontics Business And Portions Of Laboratory Business
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of positions eliminated, period percent	5.00%
Restructuring and related cost, expected cost	$ 90.0