Employee Benefit Plans Tables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.4	$ 0.4	$ 0.8	$ 0.8
Expected return on plan assets	(0.5)	(0.5)	(1.0)	(1.0)
Amortization of net actuarial loss	0.1	0.1	0.2	0.2
Net periodic benefit cost	0	0	0	0
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0	0.1	0.1
Amortization of prior service cost	0	0	(0.1)	(0.1)
Net periodic benefit cost	$ 0	$ 0	$ 0	$ 0