Pension and Post retirement Plans (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	Dec. 31, 2012
Components of net periodic benefit cost [Abstract]
Cash contributions to pension plans			$ 1.6
Pension Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0.3	0.9	1.2	1.8
Interest cost	1.7	2.3	4.1	4.6
Expected return on plan assets	(2.4)	(2.9)	(5.2)	(5.8)
Amortization of prior service cost	(0.5)	0.2	(0.4)	0.4
Amortization of net (gain) loss	2.4	1.2	4.0	2.4
Net periodic benefit cost	1.5	1.7	3.7	3.4
Expected net periodic benefit cost					7.2
Post-retirement Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	0.1	0.1	0.2
Interest cost	0.1	0.2	0.3	0.4
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of net (gain) loss	(0.1)	0	(0.1)	0
Net periodic benefit cost	0	0.3	0.3	0.6
Expected net periodic benefit cost					$ 0.4