Property and Equipment and Leases (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Leased Rail Cars	10,307
Leased Locomotives	7
Material payments to Class I carriers under certain lease agreements	$ 0
Equipment
Property, Plant and Equipment [Line Items]
Operating lease expense	13.4	19.0	13.1
Real property
Property, Plant and Equipment [Line Items]
Operating lease expense	$ 4.9	$ 4.6	$ 5.0
RailAmerica [Member]
Property, Plant and Equipment [Line Items]
Leased Rail Cars	8,004
Leased Locomotives	175