Employee Benefit Plans - Components of Net Period Benefit Expense (Details) - German Defined Benefit Pension Plan - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.2	$ 0.6
Interest cost	0.2	0.5
Net periodic benefit expense	$ 0.4	$ 1.1