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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Operating lease obligations:          
Lease and rental expense included in costs and expenses $ 26.0 $ 27.0 $ 78.1 $ 81.8  
Litigation matters [Member]          
Loss Contingencies [Line Items]          
Litigation accruals on an undiscounted basis $ 4.8   4.8   $ 0.3
Litigation matters [Member] | ETP Lawsuit [Member]          
Loss Contingencies [Line Items]          
Loss contingency, damages awarded     319.4    
Loss contingency, total damages sought     535.8    
Loss contingency, disgorgement damages sought     150.0    
Prejudgment interest     $ 66.4    
Post-judgment interest rate     5.00%    
Positive Outcome of Litigation [Member]          
Gain Contingencies [Line Items]          
Counterclaim settlement awarded     $ 0.8