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SIGNIFICANT ACCOUNTING POLICIES - CASH AND ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash and Cash Equivalents |  |  |
Outstanding checks in excess of funds on deposits | $ 13.8 | $ 16.4 |
Restricted cash | 7.2 | 4.9 |
Allowance for doubtful accounts |  |  |
Balance at Beginning of year | 4.8 | 4.6 | $ 4.2
Expense | 0.6 | 0.8 | 1.0
Write-offs and Other | (1.1) | (0.6) | (0.6)
Balance at End of Year | 4.3 | 4.8 | $ 4.6
Prepaid and Other Assets: |  |  |
Prepaid fuel | 13.7 | 16.3 |
Prepaid insurance and insurance related receivables | 13.4 | 12.6 |
Income tax receivables | 12.8 | 26.8 |
Restricted cash - vessel construction obligations | 7.2 | 4.9 |
Prepaid operating expenses | 5.7 | 6.8 |
Other | 9.7 | 7.7 |
Total | 62.5 | 75.1 |
Other Long-term Assets |  |  |
Vessel and equipment spare parts | 12.4 | 13.1 |
Income tax receivables | 11.5 | 21.5 |
Insurance related receivables | 10.6 | 11.2 |
Deferred charges and other | 3.3 | 3.7 |
Total | $ 37.8 | $ 49.5 |

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