Employee Benefit Plans - Components of Net Period Benefit Expense (Details) - German Defined Benefit Pension Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.2	$ 0.3	$ 0.4	$ 0.4
Interest cost	0.3	0.2	0.5	0.3
Amortization of net actuarial gains			(0.1)
Expected return on plan assets	(0.1)		(0.1)
Net periodic benefit expense	$ 0.4	$ 0.5	$ 0.7	$ 0.7