Fair Value Measurements (Narrative)(Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Cash And Cash Equivalent Maturity Period	90 days
Cost Method Investments		$ 3.8	$ 3.5	$ 3.1