Employee Benefit Plans (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 U. S. Plans Y market	Dec. 31, 2010 U. S. Plans	Dec. 31, 2009 U. S. Plans	Dec. 31, 2011 U. S. Plans Maximum	Dec. 31, 2011 U. S. Plans Minimum	Dec. 31, 2011 International Plans	Dec. 31, 2010 International Plans	Dec. 31, 2009 International Plans	Dec. 31, 2012 U.K. Plan	Dec. 31, 2011 U.K. Plan	Dec. 31, 2011 Remaining international plans
Employee benefit plans
Accumulated Benefit Obligation				$ 298,600,000	$ 264,800,000				$ 952,800,000	$ 869,300,000
Plans with Accumulated Benefit Obligation in Excess of Plan Assets
Projected benefit obligation				288,700,000	255,500,000				929,100,000	845,000,000
Accumulated benefit obligation				288,700,000	255,500,000				921,000,000	837,800,000
Fair value of plan assets				198,800,000	210,900,000				673,900,000	665,800,000
Target Long-Term Allocation
Domestic equity securities (as a percent)							44.00%	34.00%
Equity securities (as a percent)									40.00%
International equity securities (as a percent)							24.00%	14.00%
Fixed income securities, low end of range (as a percent)								27.00%
Fixed income securities, high end of range (as a percent)							37.00%
Fixed income securities (as a percent)									42.50%
Cash and cash equivalents (as a percent)							5.00%		0.00%
Other (as a percent)							15.00%	5.00%	17.50%
Percentage of Plan Assets
Domestic equity securities (as a percent)				38.00%	50.50%
International equity securities (as a percent)				18.00%	11.90%
Equity securities (as a percent)									34.70%	48.70%
Fixed income securities (as a percent)				32.80%	30.50%				50.00%	42.60%
Cash and cash equivalents (as a percent)				1.90%	1.50%				0.40%	0.50%
Other (as a percent)				9.30%	5.60%				14.90%	8.20%
Number of capital market results simulated in the model for expected return on plan assets				600
Period for which results of capital markets are simulated (in years)				15
Expected long-term rates of returns on plan assets for next year (as a percent)	6.90%			7.80%					6.70%			6.80%
Expected long-term rates of return on plan assets (as a percent)	7.50%	7.50%	7.40%	7.80%	8.00%	8.00%			7.40%	7.40%	7.10%		7.50%
Number of shares of Company's common stock included in plan assets				432,203	432,549
Value of shares of Company's common stock included in plan assets				9,000,000	12,200,000
Percentage of Company's common stock to total plan assets				4.30%	5.50%
Dividends paid to pension plans	$ 66,176,000	$ 66,131,000	$ 64,650,000	$ 400,000	$ 400,000	$ 300,000
Pension plan assets as a percentage of international plan assets													84.00%	16.00%