FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions |
Sep. 27, 2020 |
Dec. 31, 2019 |
---|---|---|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Cash equivalents, fair value | $ 31.0 | $ 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 | 326.1 | 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 | $ 166.9 | $ 162.5 |