Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accounts Receivable, net
Accounts receivable written off	$ 0.0	$ 0.0
Allowance for expected prompt-pay discounts	$ 4.7		$ 4.1