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Property, Plant, and Equipment (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Abstract]          
Capitalized interest $ 3.0 $ 0.8 $ 8.2 $ 2.0  
Original carrying value of assets under capital lease obligations $ 24.8   $ 24.8   $ 24.8