Principles Of Consolidation (Claims and Insurance) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Workers' Compensation [Member]
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]
Undiscounted amount	$ 390.1	$ 449.6
Estimated settlement cost	89.2	100.4
Claim payments, net of recoveries	(115.6)	(140.9)
Change in estimated settlement cost for older claim years	(16.7)	(19.0)
Undiscounted amount	347.0	390.1
Discounted settlement cost estimate	316.6
Property Damage and Liability Claims [Member]
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]
Undiscounted amount	65.1	79.9
Estimated settlement cost	36.7	27.4
Claim payments, net of recoveries	(24.3)	(43.7)
Change in estimated settlement cost for older claim years	(8.7)	1.5
Undiscounted amount	68.8	65.1
Discounted settlement cost estimate	68.2
Total [Member]
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]
Undiscounted amount	455.2	529.5
Estimated settlement cost	125.9	127.8
Claim payments, net of recoveries	(139.9)	(184.6)
Change in estimated settlement cost for older claim years	(25.4)	(17.5)
Undiscounted amount	415.8	455.2
Discounted settlement cost estimate	384.8
Cargo Claims And Other Insurance Related Amounts [Member]
LIability For Unpaid Claims And Claim Adjustment Expense, Adjustment Of Opening Balance [Roll Forward]
Undiscounted amount	$ 15.6	$ 21.0