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Contingencies and Off-Balance Sheet Commitments (Details) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2016
Jan. 31, 2016
Oct. 31, 2014
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Loss Contingencies [Line Items]            
Public liability and property damage       $ 424.0 $ 394.0  
Concession Fee Recoveries            
Loss Contingencies [Line Items]            
Litigation settlement, amount     $ 42.0      
Litigation settlement, interest     11.0      
Litigation settlement, expense     3.1      
Concession Fee Recoveries | Restitution Fund            
Loss Contingencies [Line Items]            
Litigation settlement, expense     $ 3.1      
French Road Tax            
Loss Contingencies [Line Items]            
Additional reserve established         $ 24.0 $ 23.0
French Road Tax | Ministry of the Economy, Finance and Industry, France            
Loss Contingencies [Line Items]            
Payments for other taxes   $ 9.0        
Other (income) expense, net            
Loss Contingencies [Line Items]            
Litigation settlement, amount $ 9.0