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Debt And Financing - Capital Expenditures/Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Acquisition of property and equipment $ (108.0) $ (69.2) $ (66.9)
Capital value of operating lease commitments 72.4    
Minimum annual rentals 2016 80.0    
Future minimum payments due 269.0    
Revenue Equipment [Member]      
Debt Instrument [Line Items]      
Operating lease commitment $ 130.9    
Operating lease term 4 years 5 years  
Capital value of operating lease commitments $ 131.7 $ 65.0