Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Tax credits percentage of qualified maintenance expenditures to reduce federal income tax			50.00%
Tax credits limitation per mile on maintenance expenditures to reduce federal income tax			$ 3,500
Tax benefit from short line tax credit		6,800,000		59,200,000
Effective income tax rate	33.60%	25.10%	34.80%
Tax benefit as a result of receiving consent from the IRS to change tax accounting methods retroactively	3,900,000		3,900,000
Provision for income taxes, other than the retroactive short line tax credit				63,500,000
Provision for income tax as a percentage of income before income taxes other than the retroactive short line tax credits				26.80%
RCP&E [Member]
Tax benefit from adjustment to deferred income tax assets			1,000,000
Tax Year 2012 [Member]
Retroactive tax benefit from extension of the short line tax credit				41,000,000
Tax Year 2013 [Member]
Tax benefit from short line tax credit				$ 18,300,000