Changes in Operations United States RailAmerica (Details) (RailAmerica [Member], USD $)	3 Months Ended		0 Months Ended
	Dec. 31, 2012	Oct. 02, 2012 employees railroads states track_miles provinces	Oct. 02, 2012 Common stock and TEUs [Member]	Oct. 02, 2012 The Carlyle Group [Member] Series A-1 Preferred Stock [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
RailAmerica outstanding common stock as of October 1, 2012		49,934,000
Cash purchase price per share		$ 27.50
Equity purchase price	$ 1,373,184,000
Payment of RailAmerica's outstanding term loan and revolving credit facility	659,198,000
Cash consideration	2,032,382,000
Impact of pre-acquisition share-based awards		9,400,000
Total consideration	2,041,782,000
Refinancing of debt for business acquisition		1,200,000,000
Amount of debt used to fund business acquisition		1,900,000,000
Proceeds from Issuance or Sale of Equity			475,500,000
Proceeds from issuance of preferred stock				$ 350,000,000
Number of employees acquired		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