SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Inventories | ||
| Raw materials | $ 180.2 | $ 201.0 |
| Finished Products | 162.6 | 201.4 |
| Work in process | 58.2 | 84.1 |
| Total inventories | $ 401.0 | $ 486.5 |