Pension, Profit Sharing & Other Post-Retirement Benefits - Changes in Assets and Obligations Recognized in Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss arising during the period	$ (3.3)	$ (29.9)	$ (3.2)
Amortization to net income of net actuarial loss	0.4	(0.2)	0
Deferred income taxes on pension liability	0	10.1	0.9
Total pension liability, net of tax	(2.9)	(20.0)	(2.3)
Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss arising during the period	(3.4)	(30.9)	(3.2)
Amortization to net income of net actuarial loss	0.8	0	0
Deferred income taxes on pension liability	(0.1)	10.4	0.9
Total pension liability, net of tax	(2.7)	(20.5)	(2.3)
Post- Retirement Health Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss arising during the period	0.1	1.0	0
Amortization to net income of net actuarial loss	(0.4)	(0.2)	0
Deferred income taxes on pension liability	0.1	(0.3)	0
Total pension liability, net of tax	$ (0.2)	$ 0.5	$ 0