FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions |
Mar. 29, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Cash equivalents, fair value | $ 83.9 | $ 132.6 |
| Fair Value, Inputs, Level 2 | Senior Notes | 7.50% Senior Notes Due 2027 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value of senior notes | 309.5 | 320.3 |
| Fair Value, Inputs, Level 2 | 1.0% convertible notes due 2023 | Convertible Senior Notes Due 2023 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value of convertible debt | $ 134.6 | $ 162.5 |