Income Taxes Effective Income Tax Rate (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 0.0	$ 10.5	$ 6.1
Income tax expense (benefit), change in estimate		3.4	4.8
Other Tax Expense (Benefit)		20.1
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			(8.5)
Unrecognized tax benefits, decrease resulting from cash and non-cash settlements with taxing authorities			8.4
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			$ 4.7
Mexican Tax Authority [Member]
Previously enacted tax rate			17.50%
Newly enacted tax rate			30.00%
Tax positions relating to transfer pricing [Member]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 11.5	$ 23.1