Employee Benefit Plans - Components of Net Periodic Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.4	$ 0.4	$ 0.8	$ 0.8
Expected return on plan assets	(0.6)	(0.6)	(1.2)	(1.2)
Amortization of net actuarial loss	0.1	0.2	0.2	0.3
Net periodic benefit (income) costs	(0.1)	0	(0.2)	(0.1)
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) costs	$ 0.1	$ 0.1	$ 0.1	$ 0.1