Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue recognition [Abstract]
Accrued reserve for product returns	$ 7.8	$ 10.1
Sales returns	$ 65.6	$ 83.6	$ 79.4