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SIGNIFICANT ACCOUNTING POLICIES - CASH AND ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash and Cash Equivalents |  |  |
Outstanding checks in excess of funds on deposits | $ 19.9 | $ 13.8 |
Restricted cash | 5.3 | 7.2 |
Allowance for doubtful accounts |  |  |
Balance at Beginning of year | 4.3 | 4.8 | $ 4.6
Expense | 2.9 | 0.6 | 0.8
Write-offs and Other | (0.9) | (1.1) | (0.6)
Balance at End of Year | 6.3 | 4.3 | $ 4.8
Prepaid and Other Assets: |  |  |
Prepaid fuel | 10.8 | 13.7 |
Prepaid insurance and insurance related receivables | 7.5 | 13.4 |
Prepaid operating expenses | 5.4 | 5.7 |
Restricted cash - vessel construction obligations | 5.3 | 7.2 |
Income tax receivables | 0.3 | 12.8 |
Other | 8.8 | 9.7 |
Total | 38.1 | 62.5 |
Other Long-term Assets |  |  |
Vessel and equipment spare parts | 11.5 | 12.4 |
Insurance related receivables | 10.5 | 10.6 |
Deferred loan fees | 2.7 | 2.1 |
Cloud computing software costs | 2.4 |  |
Income tax receivables | 2.1 | 11.5 |
Other | 3.8 | 1.2 |
Total | $ 33.0 | $ 37.8 |

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