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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.3	$ 0.2	$ 0.7	$ 0.6
Interest cost	0.3	0.2	0.8	0.5
Amortization of net actuarial gains	(0.1)	0.0	(0.2)	0.0
Expected return on plan assets	0.0	0.0	(0.1)	0.0
Net periodic benefit expense	$ 0.5	$ 0.4	$ 1.2	$ 1.1