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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 |  |  |  |  |  |

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