Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Liabilities
Book/tax basis difference due to depreciation	$ 852.0	$ 806.7
Investments in affiliated companies	93.7	81.6
Lease accounting (other than leveraged)	24.4	12.6
Other	0	3.1
Total deferred tax liabilities	970.1	904.0
Deferred Tax Assets
Alternative minimum tax credit	8.4	5.2
Federal net operating loss	8.9	0
Foreign tax credit	3.6	7.3
Valuation on foreign tax credit	(3.6)	(7.3)
State net operating loss	27.1	26.6
Valuation on state net operating loss	(11.2)	(12.8)
Foreign net operating loss	8.5	9.5
Deferred Tax Assets, Valuation Allowance	(0.2)	0
Accruals not currently deductible for tax purposes	14.1	19.1
Allowance for losses	2.2	6.6
Pension and post-retirement benefits	13.3	48.6
Other	7.6	18.2
Total deferred tax assets	78.7	121.0
Net deferred tax liabilities	891.4	783.0
Gross liability for unrecognized tax benefits
Beginning balance	4.7	20.8
Reductions due to expiration of the applicable statute of limitations	0	(16.1)
Reductions due to settlement of audit issues	(1.0)	0
Ending balance	$ 5.7	$ 4.7