Employee Benefit Plans - Components of Net Periodic Costs (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.3	$ 0.3	$ 0.6	$ 0.6
Expected return on plan assets	(0.2)	(0.5)	(0.4)	(1.0)
Amortization of net actuarial loss	0.2	0.2	0.4	0.4
Net periodic benefit cost	$ 0.3	$ 0.0	$ 0.6	$ 0.0