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SIGNIFICANT ACCOUNTING POLICIES - CAPITAL CONSTRUCTION FUND (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts receivable, net | $ 328.6 | $ 328.6 |  | $ 253.4
Cash Deposits Into CCF |  | 31.2 | $ 97.1 |
Withdrawals from CCF |  | 31.2 | $ 97.1 |
Eligible Accounts Receivable Assigned to CCF |  |  |  |
Accounts receivable, net | 1.8 | 1.8 |  | $ 1.7
Cash Deposits Into CCF | 0.0 | 31.2 |  |
Withdrawals from CCF | $ 0.0 | $ 31.2 |  |

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