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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of changes in the allowance for doubtful accounts receivable | Changes in the allowance for doubtful accounts receivable for the three years ended December 31, 2018, 2017 and 2016 were as follows:
|  | Balance at |  | Expense |  | Write-offs |  | Balance at |
Year (in millions) |  | Beginning of Year |  | (Recovery) (1) |  | and Other |  | End of Year |
2018 |  | $ | 4.6 |  | $ | 0.8 |  | $ | (0.6) |  | $ | 4.8 |
2017 |  | $ | 4.2 |  | $ | 1.0 |  | $ | (0.6) |  | $ | 4.6 |
2016 |  | $ | 6.6 |  | $ | (0.3) |  | $ | (2.1) |  | $ | 4.2 |
| (1) |  | Expense is shown net of amounts recovered from previously reserved doubtful accounts.
Schedule of prepaid expenses and other assets | Prepaid expenses and other assets consist of the following at December 31, 2018 and 2017:
|  | As of December 31, |
Prepaid Expenses and Other Assets (in millions) |  | 2018 |  | 2017 |
Income tax receivables |  | $ | 26.8 |  | $ | 2.6 |
Prepaid fuel |  |  | 16.3 |  |  | 14.4 |
Prepaid insurance and insurance related receivables |  |  | 12.6 |  |  | 19.3 |
Prepaid operating expenses |  |  | 6.8 |  |  | 6.3 |
Restricted cash - vessel construction obligations |  |  | 4.9 |  |  | — |
Other |  |  | 7.7 |  |  | 9.0 |
Total |  | $ | 75.1 |  | $ | 51.6 |
Schedule of other long-term assets | Other long-term assets consist of the following at December 31, 2018 and 2017:
|  | As of December 31, |
Other Long-Term Assets (in millions) |  | 2018 |  | 2017 |
Income tax receivables |  | $ | 21.5 |  | $ | 50.2 |
Vessel and equipment spare parts |  |  | 13.1 |  |  | 12.7 |
Insurance related receivables |  |  | 11.2 |  |  | 12.9 |
Deferred Charges and other |  |  | 3.7 |  |  | 7.8 |
Capital construction fund - cash on deposit (see Note 7) |  |  | — |  |  | 0.9 |
Total |  | $ | 49.5 |  | $ | 84.5 |
Schedule of estimated useful lives of property and equipment |
Classification |  | Life |
Vessels |  | 40 years |
Machinery and equipment |  | 30 years |
Terminal facilities |  | 35 years |
Schedule of accrued and other liabilities | Accruals and other liabilities consist of the following at December 31, 2018 and 2017:
|  | As of December 31, |
Accruals and Other Liabilities (in millions) |  | 2018 |  | 2017 |
Payroll and vacation related accruals |  | $ | 25.7 |  | $ | 24.7 |
Employee incentives and other related accruals |  |  | 19.5 |  |  | 17.4 |
Uninsured risks and related liabilities - short term |  |  | 9.9 |  |  | 15.4 |
Deferred revenues |  |  | 5.7 |  |  | 5.0 |
Interest on debt |  |  | 5.1 |  |  | 5.4 |
Multi-employer withdrawal liabilities - short term (see Note 12) |  |  | 10.8 |  |  | 4.1 |
Pension and post-retirement liabilities - short term (see Note 11) |  |  | 3.0 |  |  | 3.0 |
Other short-term liabilities |  |  | 2.2 |  |  | 5.4 |
Total |  | $ | 81.9 |  | $ | 80.4 |
Schedule of other long-term liabilities | Other long-term liabilities consist of the following at December 31, 2018 and 2017:
|  | As of December 31, |
Other Long-Term Liabilities (in millions) |  | 2018 |  | 2017 |
Pension and post-retirement liabilities (see Note 11) |  | $ | 79.4 |  | $ | 75.1 |
Multi-employer withdrawal liability (see Note 12) |  |  | 56.6 |  |  | 65.1 |
Uninsured risks and related liabilities |  |  | 27.3 |  |  | 29.5 |
Other long-term liabilities |  |  | 14.0 |  |  | 8.5 |
Total |  | $ | 177.3 |  | $ | 178.2 |
Ocean Transportation |
Schedule of principal revenue generating activities by segment |
|  |  | Year Ended December 31, |
Ocean Transportation (in millions) (1) |  |  | 2018 |  | 2017 |  | 2016 |
Ocean Transportation services |  |  | $ | 1,599.3 |  | $ | 1,531.8 |  | $ | 1,504.5 |
Terminal and other related services |  |  |  | 23.0 |  |  | 23.5 |  |  | 22.9 |
Fuel sales |  |  |  | 12.2 |  |  | 9.9 |  |  | 7.5 |
Vessel management and related services |  |  |  | 6.8 |  |  | 6.6 |  |  | 6.2 |
Total |  |  | $ | 1,641.3 |  | $ | 1,571.8 |  | $ | 1,541.1 |
| (1) |  | Ocean Transportation revenue transactions are primarily denominated in U.S. dollars except for less than 3 percent of Ocean Transportation services revenue and fuel sales revenue categories which are denominated in foreign currencies.
Logistics |
Schedule of principal revenue generating activities by segment |
|  |  | Year Ended December 31, |
Logistics (in millions) (1) |  |  | 2018 |  | 2017 |  | 2016 |
Transportation Brokerage and Freight Forwarding services |  |  | $ | 549.1 |  | $ | 445.1 |  | $ | 373.7 |
Warehouse and distribution services |  |  |  | 19.1 |  |  | 17.5 |  |  | 19.7 |
Supply chain management and other services |  |  |  | 13.3 |  |  | 12.5 |  |  | 7.1 |
Total |  |  | $ | 581.5 |  | $ | 475.1 |  | $ | 400.5 |
| (1) |  | Logistics revenue transactions are primarily denominated in U.S. dollars except for less than 3 percent of transportation brokerage and freight forwarding services revenue, and supply chain management and other services revenue categories which are denominated in foreign currencies.

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