Income Taxes Tax Reform (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Foreign Earnings Repatriated	$ 24.0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Income Tax Expense (Benefit)	$ 1.1
RepatriationTollCharge	$ 2.0