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CAPITAL CONSTRUCTION FUND (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Maximum period to commit fund deposits for qualified purposes | 25 years |  |
Period over which deposits will be treated as non-qualified withdrawals | 5 years |  |
Cash Deposits Into CCF | $ 123.4 | $ 77.9 | $ 31.9
Accounts receivable, net | 189.5 | 192.8 |
Eligible Accounts Receivable Assigned to CCF |  |  |
Accounts receivable, net | 174.7 | 176.6 |
Cash | Long-term Assets |  |  |
Capital Construction Fund - cash on deposit | $ 31.2 | $ 31.2 |

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