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Insurance Matters (Details) (February 2011 West Storage Incident [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
February 2011 West Storage Incident [Member]
     
Loss Contingencies [Line Items]      
Estimate of cost related to incident   $ 91.9  
Gains related to property damage proceeds 27.7 8.8 27.7
Proceeds from property damage insurance recoveries $ 27.7 $ 8.8 $ 27.7