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SIGNIFICANT ACCOUNTING POLICIES - CAPITAL CONSTRUCTION FUND (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts receivable, net | $ 221.7 |  | $ 194.6
Cash Deposits Into CCF | 198.3 | $ 12.2 |
Qualifying withdrawal from CCF | 199.2 | $ 43.4 |
Eligible Accounts Receivable Assigned to CCF |  |  |
Accounts receivable, net | $ 124.7 |  | 134.8
Long-term Assets | Cash |  |  |
Capital Construction Fund - cash on deposit |  |  | $ 0.9

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