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NEW ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions | Jul. 03, 2021 | Apr. 03, 2021 | Dec. 31, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' equity | $ 728.2 | $ 660.8 | $ 629.2 | $ 552.1 | $ 515.1 |  | $ 502.4
Retained Deficit |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' equity | $ (399.8) | $ (461.3) | $ (488.1) | $ (535.5) | $ (562.6) |  | $ (584.8)
Cumulative Effect, Period of Adoption, Adjustment | Retained Deficit |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | $ (0.5) |

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