Postemployment Benefits Components of Net Benefits and Costs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2005 years
Health and Welfare [Member]
Postemployment and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 0.1		$ 0.1		$ 0.1
Interest cost	0.2		0.3		0.3
Actuarial (gain) loss	0.1	[1]	1.6	[1]	0.8	[1]
Foreign currency (gain) loss	0		0		0
Prior service credit	(0.2)	[2]	(0.2)	[2]	(0.3)	[2]
Net periodic cost (benefit) recognized	0.2		1.8		0.9
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprenhensive Income (Loss), Net Prior Service Cost (Credit), before Tax							2.3
Defined Benefit Plan, Amortization of Prior Service Amortization Period							9.5
Postemployment Benefits [Member]
Postemployment and Other Postretirement Benefit Plans [Line Items]
Service cost	0.9		0.9		1.3
Interest cost	0.8		0.9		1.4
Actuarial (gain) loss	3.1	[1]	0.8	[1]	(7.6)	[1]
Foreign currency (gain) loss	0.6		(1.4)		0.9
Prior service credit	0		0		0
Net periodic cost (benefit) recognized	$ 5.4		$ 1.2		$ (4.0)

[1] Net benefit costs above do not include a component for the amortization of actuarial gains or losses as the Company’s policy is to recognize such gains and losses immediately.

[2] During 2005, the Company revised its medical plan to exclude prescription drug coverage available under Medicare part D. This negative plan amendment generated an unrecognized prior service benefit of $2.3 million which is being amortized over the estimated remaining life of the affected participants of 9.5 years.