Income Taxes - Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Decrease on qualified production deductions, current period, percent	2.30%
Decrease on qualified production deductions, prior period, percent	3.70%
Decrease on research tax credits, current period, percent	0.50%
Decrease on research tax credits, prior period, percent	2.90%
Unrecognized tax benefits	$ 3.9	$ 3.4	$ 2.7	$ 6.7
Unrecognized tax benefit changes in next 12 months	1.0
Unrecognized tax benefits, interest on income taxes accrued	4.9	3.9
Unrecognized tax benefits, income tax penalties accrued	0.1	0.1
Change in accrued interest related to increase in unrecognized tax benefits and penalties	1.0
Valuation allowance	1.1	$ 1.1
Valuation allowance, noncurrent	$ 1.1