Income Taxes Tax Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
United States Short Line Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount	$ 237.4
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	354.3
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards	$ 25.6
Minimum [Member] | United States Short Line Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2026
Minimum [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Jan. 01, 2016
Minimum [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Jan. 01, 2018
Maximum [Member] | United States Short Line Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2035
Maximum [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2035
Maximum [Member] | Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2024