Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data	Jun. 30, 2011	Dec. 31, 2010
Shareholders' Equity
Common stock, par value	$ 0.625	$ 0.625
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	65,704,063	65,482,950
Common stock, shares outstanding	46,581,543	46,360,430
Treasury stock, shares outstanding	19,122,520	19,122,520
Variable Interest, Held by Entity
Operating Assets and Facilities
VIE for Rail	$ 123.5	$ 123.7
VIE depreciation allowance	16.4	13.6
Debt
VIE nonrecourse debt	50.8	56.2
Series A and B $2.50 Cumulative Convertible Preferred Stock
Shareholders' Equity
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	16,644	16,694
Preferred stock, shares outstanding	16,644	16,694
Preferred stock, aggregate liquidation preference	$ 1.0	$ 1.0