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Summary Of Significant Accounting Policies (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2011
Pension Benefits [Member]
Dec. 31, 2010
Pension Benefits [Member]
Dec. 31, 2009
Pension Benefits [Member]
Dec. 31, 2011
Pension Benefit - Significant Assumptions Table [Member]
Dec. 31, 2011
Other Postretirement Benefits [Member]
Dec. 31, 2010
Other Postretirement Benefits [Member]
Dec. 31, 2009
Other Postretirement Benefits [Member]
Dec. 31, 2011
Domestic Pension Benefits [Member]
Dec. 31, 2010
Domestic Pension Benefits [Member]
Dec. 31, 2009
Domestic Pension Benefits [Member]
Dec. 31, 2011
U.S. Postretirement Benefit Plan [Member]
Dec. 31, 2011
U.K. Defined Contribution Plan [Member]
Dec. 31, 2010
U.K. Defined Contribution Plan [Member]
Dec. 31, 2009
U.K. Defined Contribution Plan [Member]
Dec. 31, 2011
Netherlands Defined Contribution Plan [Member]
Dec. 31, 2010
Netherlands Defined Contribution Plan [Member]
Dec. 31, 2009
Netherlands Defined Contribution Plan [Member]
Dec. 31, 2011
US Treasury Securities [Member]
Dec. 31, 2010
US Treasury Securities [Member]
Dec. 31, 2004
US Treasury Securities [Member]
Dec. 31, 2011
Previously Reported [Member]
Pension Benefits [Member]
Dec. 31, 2011
Previously Reported [Member]
Pension Benefit - Significant Assumptions Table [Member]
Dec. 31, 2011
Previously Reported [Member]
Other Postretirement Benefits [Member]
Dec. 31, 2011
Pre-65 Coverage [Member]
Dec. 31, 2011
Post-65 Coverage [Member]
Dec. 31, 2011
401(k) Contributions [Member]
U.S. Defined Contribution Plan [Member]
Dec. 31, 2010
401(k) Contributions [Member]
U.S. Defined Contribution Plan [Member]
Dec. 31, 2009
401(k) Contributions [Member]
U.S. Defined Contribution Plan [Member]
Dec. 31, 2011
Pension Contribution [Member]
U.S. Defined Contribution Plan [Member]
Dec. 31, 2010
Pension Contribution [Member]
U.S. Defined Contribution Plan [Member]
Dec. 31, 2009
Pension Contribution [Member]
U.S. Defined Contribution Plan [Member]
Dec. 31, 2011
Pension Contribution [Member]
U.S. Defined Contribution Plan [Member]
Minimum [Member]
Dec. 31, 2011
Pension Contribution [Member]
U.S. Defined Contribution Plan [Member]
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]                                                                            
Percentage of interest in joint ventures       20.00% 50.00%                                                                  
Amortization period in months 12                                                                          
Definite-lived intangible assets, minimum useful life, years 3                                                                          
Definite-lived intangible assets, maximum useful life, years 50                                                                          
Weighted-average discount rate           5.04% 5.40%     5.10% 5.30%   5.07% 5.45%                       5.40%   5.30%                    
Weighted-average expected rate of return on plan assets           8.19% 8.19% 8.69% 8.25% 7.00% 7.00% 7.00% 8.25% 8.25% 8.75% 7.00%                                            
Assumed weighted-average rate of compensation           3.93% 3.90% 4.11% 3.96% 4.00% 4.00% 4.25% 4.11% 4.11% 4.33%                       3.93%                      
Ultimate health care cost trend rate 0.00%                                                       8.00% 0.00%                
Ultimate health care cost trend rate in future                                                         0.00%                  
Employer contributions           $ 56,105,000 $ 76,841,000     $ 3,668,000 $ 3,264,000   $ 51,157,000 $ 71,897,000     $ 300,000 $ 400,000 $ 400,000                       $ 9,100,000 $ 8,400,000 $ 8,200,000 $ 4,500,000 $ 3,900,000 $ 3,500,000    
Annual contribution percentage to defined contribution plan for eligible employees 5.00%                                                                 5.00%        
Percentage of participants basic pay       6.00% 7.00%                                                               6.00% 7.00%
Annual premiums and related costs pertaining to defined contribution plan                                       9,900,000 8,800,000 9,000,000                                
Foreign exchange transaction gains (losses) (3,600,000) 1,000,000 (3,700,000)                                                                      
Notional value of outstanding foreign currency forward contracts 148,700,000 375,400,000                                                                        
Notional value of treasury lock securities                                                 275,000,000                          
Percentage of public offering of senior notes                                                 85.00%                          
Treasury lock securities, yield                                                 4.25%                          
Treasury lock securities, fixed rate                                             4.25%                              
Cumulative loss on treasury lock securities                                                 2,200,000                          
Unrealized losses in accumulated other comprehensive loss, before tax                                             700,000 900,000                            
Unrealized losses in accumulated other comprehensive loss, after tax                                             $ 400,000 $ 600,000