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Employee Benefit Plans (Details 8) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined contribution retirement plans
Defined Contribution Retirement Plans
Maximum voluntary contribution by eligible U.S. employees as a percentage of their compensation	50.00%
Number of shares contributed (in shares)	271	269	347
Compensation expense	$ 18.0	$ 16.7	$ 17.4
Supplemental Retirement Savings Plan (SRSP)
Defined Contribution Retirement Plans
Compensation expense	0.4	0.4	0.8
Supplemental Retirement Savings Plan (SRSP) \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Contribution Retirement Plans
Fair value of plan assets	$ 47.0	$ 47.3

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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