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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ 251.5 | $ 234.2 | $ 250.1 | $ 235.1 |  |  |  |  |
Other comprehensive loss before reclassifications | (0.4) | 19.3 | (2.0) | 19.4 |  |  |  |  |
Impact of initial adoption of ASC 606 |  |  | (0.3) |  |  |  |  |  |
Stranded income tax effects resulting from tax reform |  |  | 4.8 |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.6) | (0.2) | (2.1) | (1.2) |  |  |  |  |
Current-period other comprehensive loss | (1.0) | 19.1 | 0.4 | 18.2 |  |  |  |  |
Balance at end of period | 250.5 | 253.3 | 250.5 | 253.3 |  |  |  |  |
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | 229.4 | 229.3 | 230.2 | 229.7 |  |  |  |  |
Other comprehensive loss before reclassifications | 0.0 | 2.4 | (0.8) | 2.0 |  |  |  |  |
Impact of initial adoption of ASC 606 |  |  |  |  |  |  |  |  |
Stranded income tax effects resulting from tax reform |  |  | 0.0 |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |  |
Current-period other comprehensive loss | 0.0 | 2.4 | (0.8) | 2.0 |  |  |  |  |
Balance at end of period | 229.4 | 231.7 | 229.4 | 231.7 |  |  |  |  |
Net Unrealized Gains (Losses) on Qualifying Cash Flow Hedges |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | (0.2) | 1.3 | 0.8 | 1.5 |  |  |  |  |
Other comprehensive loss before reclassifications | (0.4) | 0.6 | (1.2) | 1.1 |  |  |  |  |
Impact of initial adoption of ASC 606 |  |  | (0.3) |  |  |  |  |  |
Stranded income tax effects resulting from tax reform |  |  | 0.2 |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0.3 | (0.1) | 0.2 | (0.8) |  |  |  |  |
Current-period other comprehensive loss | (0.1) | 0.5 | (1.1) | 0.3 |  |  |  |  |
Balance at end of period | (0.3) | 1.8 | (0.3) | 1.8 |  |  |  |  |
Tax benefit (provision) | 0.1 | (1.1) | 0.1 | (1.1) | $ 0.1 | $ (0.5) | $ (0.8) |  | $ (0.9)
Pension and Postretirement Liability Adjustment |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at beginning of period | 22.3 | 3.6 | 19.1 | 3.9 |  |  |  |  |
Other comprehensive loss before reclassifications | 0.0 | 16.3 | 0.0 | 16.3 |  |  |  |  |
Impact of initial adoption of ASC 606 |  |  | 0.0 |  |  |  |  |  |
Stranded income tax effects resulting from tax reform |  |  | 4.6 |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.9) | (0.1) | (2.3) | (0.4) |  |  |  |  |
Current-period other comprehensive loss | (0.9) | 16.2 | 2.3 | 15.9 |  |  |  |  |
Balance at end of period | 21.4 | 19.8 | 21.4 | 19.8 |  |  |  |  |
Tax benefit (provision) | $ (7.2) | (12.9) | $ (7.2) | $ (12.9) | $ (7.3) | $ (12.5) |  | $ (2.6) | $ (2.7)
Postretirement Plans |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |  |  |  |  |
Increase (decrease) for plan amendment |  | $ 26.8 |  |  |  |  |  |  |

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