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Pension Plans And Other Postretirement Benefits (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2005
Dec. 31, 2011
U.S. Postretirement Benefit Plan [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
Traditional Long Equity Holdings [Member]
Dec. 31, 2011
Supplemental Executive Retirement Plan [Member]
Dec. 31, 2010
Supplemental Executive Retirement Plan [Member]
Dec. 31, 2009
Supplemental Executive Retirement 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
Maximum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2011
Domestic Pension Benefits [Member]
Dec. 31, 2010
Domestic Pension Benefits [Member]
Dec. 31, 2011
Foreign Plans [Member]
Dec. 31, 2010
Foreign Plans [Member]
Dec. 31, 2011
Pre-65 Coverage [Member]
Dec. 31, 2011
Post-65 Coverage [Member]
Dec. 31, 2012
Scenario, Forecast [Member]
Dec. 31, 2012
Scenario, Forecast [Member]
U.S. Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]                                                  
Annual contribution percentage to defined contribution plan for eligible employees 5.00%                                                
Increase in the percentage of pension contribution for employees                               7.00% 6.00%                
Pension contributions $ 4.5 $ 3.9 $ 3.5                   $ 0.3 $ 0.4 $ 0.4                    
Employer contributions                                   50.0              
Annual premiums and related costs - Netherlands 9.9 8.8 9.0                                            
Accumulated benefit obligation for defined benefit pension plans 657.0 598.6                                              
Postretirement medical benefit available to U.S. employees, change of age group, current range       under age 50                                          
Age group for capping of retiree medical premium       age 50 and above                                          
Expected return on plan assets         7.00% 7.00% 7.00% 7.00%                   8.25% 8.25%            
Weighted-average expected return on plan assets                                       4.50% 4.50%        
Target allocation percentage of assets, equity securities 65.00%               35.00%                                
Change in percentage of broad asset class targets 10.00%                                                
Expenses relating to SERP                   4.5 3.6 3.6                          
Expected additional contributions to domestic nonqualified and foreign qualified and nonqualified pension plans                                               17.0 5.3
Projected benefit obligation recognized                   31.9 28.2                            
Benefits expected to be paid to SERP retirees           5.1       13.9                              
Assumed trend rate                                           8.00% 0.00%    
Ultimate trend rate 0.00%                                         8.00% 0.00%    
Defined Benefit Plan Ultimate Health Care Cost Future Trend Rate                                           0.00%      
Percentage of increase/decrease with no material effect on benefit obligation and cost components 1.00%                                                
Accrued postemployment benefit liability $ 0.6 $ 0.7