OTHER FINANCIAL INFORMATION - Allowances (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Sales Returns and Allowances and Allowance for Doubtful Accounts [Abstract] | |||
| Beginning balance | $ 36.0 | $ 28.3 | $ 18.0 |
| Provision charged to expense | 59.6 | 55.3 | 55.3 |
| Deductions | (43.6) | (47.6) | (45.0) |
| Ending balance | 52.0 | 36.0 | 28.3 |
| Change in Inventory Obsolescence [Abstract] | |||
| Beginning balance | 30.6 | 15.3 | 1.2 |
| Provision charged to expense | 21.3 | 20.9 | 14.4 |
| Write-offs and other | 7.8 | (5.6) | (0.3) |
| Ending balance | 59.7 | 30.6 | 15.3 |
| Change in the income tax valuation allowance | |||
| Beginning balance | 208.0 | 108.5 | 89.0 |
| Additions (reductions) charged to expense | 17.0 | 105.1 | 1.9 |
| Additions (reductions) charged to other accounts | (19.3) | (5.6) | 17.6 |
| Ending balance | $ 205.7 | $ 208.0 | $ 108.5 |