Significant Accounting Policies Insurance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 Liability Policies [Member]	Dec. 31, 2012 Property Policies [Member]	Dec. 28, 2012 RailAmerica [Member] Liability Policies [Member]	Dec. 31, 2012 RailAmerica [Member] Property Policies [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Self-Insured Retention, Maximum Per Incident	$ 0.5	$ 1.0	$ 1.0	$ 1.5
Prior Self-Insured Retention, Maximum Per Incident			$ 4.0