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SIGNIFICANT ACCOUNTING POLICIES - CASH AND ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CAPITAL CONSTRUCTION FUND |  |  |
Restricted Cash | $ 2.3 | $ 3.9 |
Allowance for doubtful accounts |  |  |
Balance at Beginning of year | 13.0 | 10.1 | $ 6.3
Expense | (2.1) | 3.2 | 4.2
Write-offs and Other | (1.0) | (0.3) | (0.4)
Balance at End of Year | $ 9.9 | $ 13.0 | $ 10.1

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