Significant Accounting Policies Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Material losses incurred through dispositions from unanticipated or unusual events	$ 0	$ 0	$ 0
Minimum [Member] | Buildings and leasehold improvements (subject to term of lease)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum [Member] | Bridges/tunnels/culverts
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Minimum [Member] | Track property
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Minimum [Member] | Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum [Member] | Locomotives and railcars
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum [Member] | Vehicles and mobile equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum [Member] | Signals and crossing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	4 years
Minimum [Member] | Track equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum [Member] | Other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Maximum [Member] | Buildings and leasehold improvements (subject to term of lease)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Maximum [Member] | Bridges/tunnels/culverts
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	50 years
Maximum [Member] | Track property
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	50 years
Maximum [Member] | Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Maximum [Member] | Locomotives and railcars
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Maximum [Member] | Vehicles and mobile equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Maximum [Member] | Signals and crossing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Maximum [Member] | Track equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Maximum [Member] | Other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years