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SIGNIFICANT ACCOUNTING POLICIES - IMMATERIAL CORRECTION (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
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 | Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities | $ 177.3 |  |  |  | $ 178.2 |  |  |  | $ 177.3 | $ 178.2 |  |
Goodwill | 327.8 |  |  |  | 327.8 |  |  |  | 327.8 | 327.8 |  |
Income tax expense | 6.3 | $ 13.3 | $ 8.8 | $ 10.3 | (146.0) | $ 21.5 | $ 15.6 | $ 3.1 | 38.7 | (105.8) | $ 49.1 |
Net Income | 20.6 | $ 41.6 | $ 32.6 | $ 14.2 | 165.9 | $ 34.1 | $ 24.0 | $ 7.0 | 109.0 | 231.0 | $ 81.4 |
Ocean Transportation |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 222.6 |  |  |  |  |  |  |  | $ 222.6 |  |  |
Adjustments | Revision of Defined Benefit Plan Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 6.7
Deferred income taxes |  |  |  |  | $ 1.0 |  |  |  |  | 1.0 |  | (2.6)
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 4.1
Income tax expense |  |  |  |  |  |  |  |  |  | 1.0 |  |
Net Income |  |  |  |  |  |  |  |  |  | $ (1.0) |  |

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