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CAPITAL CONSTRUCTION FUND (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CAPITAL CONSTRUCTION FUND      
Maximum period to commit fund deposits for qualified purposes 25 years    
Period over which deposits will be treated as non-qualified withdrawals 5 years    
Deposits into Capital Construction Fund $ (4.4) $ (4.4) $ (4.4)
Eligible accounts receivable assigned to the Capital Construction Fund 111.8    
Qualified withdrawals from the CCF 4.4    
Deposits to the CCF by way of assigned eligible accounts receivable $ 112.0