Income Taxes Tax Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	$ 292.5
State and Local Jurisdiction [Member] | Minimum [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Jan. 01, 2019
State and Local Jurisdiction [Member] | Maximum [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2038
Internal Revenue Service (IRS) [Member] | United States Short Line Tax Credit [Member]
Tax Credit Carryforward [Line Items]
United States track maintenance credit carryforward	$ 152.3
Internal Revenue Service (IRS) [Member] | Minimum [Member] | United States Short Line Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2026
Internal Revenue Service (IRS) [Member] | Maximum [Member] | United States Short Line Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2037