Pension, Profit Sharing & Other Post-Retirement Benefits - Net Periodic Benefit Cost (Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.4	$ 0.5	$ 0.4
Interest cost	7.5	8.6	8.9
Expected return on plan assets	(7.0)	(9.3)	(8.5)
Net amortization of actuarial loss	0.8	0	0
Settlement gain	0	0	0
Net periodic benefit cost (income)	1.7	(0.2)	0.8
Post- Retirement Health Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	0.1	0.2	0.3
Expected return on plan assets	0	0	0
Net amortization of actuarial loss	(0.2)	(0.1)	0
Settlement gain	(0.2)	(0.1)	0
Net periodic benefit cost (income)	$ (0.3)	$ 0	$ 0.3