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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
New Lease Agreements [Member]
Jun. 30, 2014
Litigation matters [Member]
Dec. 31, 2013
Litigation matters [Member]
Jun. 30, 2014
Litigation matters [Member]
ETP Lawsuit [Member]
Loss Contingencies [Line Items]                
Litigation accruals on an undiscounted basis           $ 2.3 $ 3.7  
Loss contingency, damages awarded               319.4
Loss contingency, total damages sought               535.8
Loss contingency, disgorgement damages sought               150
Prejudgment interest               66.4
Post-judgment interest rate               5.00%
Operating lease obligations [Abstract]                
Lease and rental expense included in costs and expenses 22.5 23.3 45.7 45.3        
Contractual obligation [Line Items]                
Total lease commitments over the next five years         34      
Total lease commitments         $ 144