Employee Benefit Plans - Components of Net Periodic Costs (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.4	$ 0.4	$ 0.8	$ 0.8
Expected return on plan assets	(0.5)	(0.6)	(1.0)	(1.2)
Amortization of net actuarial loss	0.2	0.1	0.3	0.2
Net periodic benefit cost (income)	$ 0.1	$ (0.1)	$ 0.1	$ (0.2)