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SIGNIFICANT ACCOUNTING POLICIES - CAPITAL CONSTRUCTION FUND (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Accounts receivable, net | $ 218.8 |  | $ 205.9
Cash Deposits Into CCF | 70.4 | $ 13.4 |
Qualifying withdrawal from CCF | 70.4 | 13.4 |
Eligible Accounts Receivable Assigned to CCF |  |  |
Accounts receivable, net | 1.7 |  | $ 1.7
Cash Deposits Into CCF | 70.4 | 13.4 |
Qualifying withdrawal from CCF | $ 70.4 | $ 13.4 |

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