Employee Benefit Plans Tables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 0.6	$ 0.5	$ 1.4	$ 1.3
Expected return on plan assets	(0.6)	(0.5)	(1.6)	(1.5)
Amortization of net actuarial loss	0.1	0	0.3	0.2
Net periodic benefit cost	0.1	0	0.1	0
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.1	0.2	0.2
Amortization of prior service credit	(0.1)	(0.1)	(0.1)	(0.1)
Net periodic benefit cost	$ 0	$ 0	$ 0.1	$ 0.1