Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	35.00%	35.00%	35.00%
Decreases in interest and penalty obligations	$ 0.2	$ 0.1	$ 0.2
Interest obligations	0.8	$ 1.2
Tax-effected unrecognized benefits	$ 0.1