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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Cash Flows [Abstract]    
Capitalized interest $ 0.4us-gaap_InterestPaidCapitalized $ 2.3us-gaap_InterestPaidCapitalized