Changes in Operations United States RailAmerica (Details) (RailAmerica [Member], USD $)	0 Months Ended	3 Months Ended	6 Months Ended
	Oct. 02, 2012 states provinces employee railroad mile	Jun. 30, 2013	Jun. 30, 2013
RailAmerica [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired	100.00%
Cash purchase price per share	$ 27.50
Total consideration	$ 2,000,000,000
Equity purchase price	1,400,000,000
Net debt acquired	659,200,000
Number of employees	2,000
Number of railroads acquired	45
Track miles acquired	7,100
Number of U.S states in which entity operates	28
Canadian provinces operated in	3
RailAmerica integration costs		$ 1,200,000	$ 14,000,000