Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Tax Expense	$ 1.1	$ 2.3	$ 0.4	$ 2.8
U.S. Federal & State and Foreign Tax Provision				3.9
Tax Benefit From Previously Reserved Uncertain Tax Positions				$ 1.1