Schedule II (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, Beginning Of Year	$ 12.0		$ 14.5		$ 36.1
Additions - Charged to Costs/Expenses	9.4		13.2		3.4
Additions - Charged to Other Accounts	0		0		0
Deductions	(11.6)	[1]	(15.7)	[1]	(25.0)	[1]
Balance, End of Year	9.8		12.0		14.5
Claims And Insurance Accruals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, Beginning Of Year	500.7		515.2		536.8
Additions - Charged to Costs/Expenses	181.9		240.6		237.8
Additions - Charged to Other Accounts	0		0		0
Deductions	(245.3)	[1]	(255.1)	[1]	(259.4)	[1]
Balance, End of Year	$ 437.3		$ 500.7		$ 515.2

[1] Regarding the allowance for uncollectible accounts, deductions primarily relate to uncollectible accounts written off, net of recoveries and the disposition of Logistics. For the claims and insurance accruals, deductions primarily relate to payments of claims and insurance.