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SIGNIFICANT ACCOUNTING POLICIES - NEW ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss, net |  | $ (34.5) |  |  |  | $ (24.9) |  |  |  | $ (34.5) | $ (24.9) |
Retained earnings |  | 460.0 |  |  |  | 380.5 |  |  |  | 460.0 | 380.5 |
Other income (expense), net |  | $ 0.7 | $ 0.7 | $ 0.4 | $ 0.8 | $ 0.5 | $ 3.5 | $ (1.1) | $ (0.8) | 2.6 | 2.1 | $ (2.1)
Accounting Standards Update 2018-02 | Adjustments for New Accounting Principle, Early Adoption |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss, net |  |  |  |  | (6.0) |  |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 6.0 |  |  |  |  |  |  |
Accounting Standards Update 2017-07 | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net |  |  |  |  |  |  |  |  |  | $ 2.1 | $ 2.1 |
Accounting Standards Update 2016-02 | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use asset | $ 252.9 |  |  |  |  |  |  |  |  |  |  |
Current lease liability | 54.2 |  |  |  |  |  |  |  |  |  |  |
Long-term lease liability | 206.4 |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 5.9 |  |  |  |  |  |  |  |  |  |  |

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