Employee Benefit Plans - Components of Net Period Benefit Expense (Details) - German Defined Benefit Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.2	$ 0.1
Interest cost	0.2	0.1
Amortization of net actuarial gains	(0.1)
Net periodic benefit expense	$ 0.3	$ 0.2