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CONSOLIDATED STATEMENTS OF CASH FLOWS NON-CASH SUPPLEMENTAL DATA (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
CONSOLIDATED STATEMENTS OF CASH FLOWS NON-CASH SUPPLEMENTAL DATA    
Accounts payable for property and equipment purchases $ 0.2 $ 2.0