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Accounting Policies (Claims and Insurance) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Workers' Compensation [Member]    
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]    
Undiscounted amount $ 339.1 $ 347.0
Estimated settlement cost 92.8 94.3
Claim payments, net of recoveries (115.0) (114.5)
Change in estimated settlement cost for older claim years (1.4) 12.3
Undiscounted amount 315.5 339.1
Discounted settlement cost estimate 291.6  
Property Damage and Liability Claims [Member]    
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]    
Undiscounted amount 75.0 68.8
Estimated settlement cost 37.0 39.0
Claim payments, net of recoveries (41.0) (40.8)
Change in estimated settlement cost for older claim years 13.9 8.0
Undiscounted amount 84.9 75.0
Discounted settlement cost estimate 84.1  
Total [Member]    
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]    
Undiscounted amount 414.1 415.8
Estimated settlement cost 129.8 133.3
Claim payments, net of recoveries (156.0) (155.3)
Change in estimated settlement cost for older claim years 12.5 20.3
Undiscounted amount 400.4 414.1
Discounted settlement cost estimate 375.7  
Cargo Claims And Other Insurance Related Amounts [Member]    
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]    
Undiscounted amount 20.8  
Undiscounted amount $ 17.0 $ 20.8