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Insurance Matters (Details) (February 2011 West Storage Incident [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
February 2011 West Storage Incident [Member]
   
Loss Contingencies [Line Items]    
Proceeds from property damage insurance recoveries $ 95.0 $ 8.8
Gains related to property damage proceeds $ 95.0 $ 8.8