Employee Benefit Plans - Tables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.4	$ 0.4
Expected return on plan assets	(0.6)	(0.5)
Amortization of net actuarial loss	0.1	0.1
Net periodic benefit cost	(0.1)	0
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0.1
Amortization of prior service credit	0	0
Net periodic benefit cost	$ 0	$ 0.1