Retirement Plans and Post Retirement Benefits Funded Status, Assumptions Used in Benefit Obligations and Amounts Recognized in Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year balance	$ 316.2	$ 290.9
Service cost	2.9	2.8	7.5
Interest cost	15.9	16.5	16.3
Actuarial (gain)/loss	23.4	21.4
Curtailments/settlements	0	0.2
Foreign exchange rate changes	(1.5)	2.6
Benefits paid	(17.6)	(18.2)
Benefit obligation, end of year balance	339.3	316.2	290.9
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	255.2	232.7
Actual return on plan assets	(1.7)	26.4
Defined Benefit Plan, Contributions by Employer	11.9	11.8
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(0.7)	2.5
Benefits paid	(17.6)	(18.2)
Fair value of plan assets, end of year balance	247.1	255.2	232.7
Funded status	(92.2)	(61.0)
Weighted average assumptions for obligations as of measurement date [Abstract]
Discount rate	4.41%	5.16%
Rate of compensation increase	0.61%	0.62%
Amounts Recognized in Balance Sheet [Abstract]
Noncurrent pension assets, included in “Other assets”	1.0	0.8
Current pension liabilities, included in “Accounts payable and accrued liabilities”	(0.2)	(0.2)
Noncurrent pension liabilities, included in “Other long-term liabilities”	(93.0)	(61.6)
Total	(92.2)	(61.0)
Amounts recognized in other comprehensive income—pre-tax [Abstract]
Net actuarial loss	153.2	115.1
Prior service cost	0.7	1.0
Total	153.9	116.1
Accumulated benefit obligation	334.0	312.2
Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Accumulated benefit obligations	320.8	299.7
Fair value of plan assets	232.9	242.3
Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligations	326.1	303.6
Fair value of plan assets	232.9	242.3
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net actuarial loss	6.5
Prior service cost	0.3
Total	$ 6.8