Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plans (Narrative) (Details)

v2.4.0.6
Stock Compensation Plans (Narrative) (Details) (USD $)
 6 Months Ended 8 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Portion Of Salary Payable In Stock Units [Member]
Dec. 31, 2011
Ice Plan2007 [Member]
Mar. 08, 2010
Ice Plan2007 [Member]
Dec. 31, 2011
Ice Plan2007 [Member]
Long Term Performance Plan20112013 [Member]
Dec. 17, 2009
Ice Plan2007 [Member]
Long Term Performance Plan20112013 [Member]
Dec. 31, 2011
Directors Plan [Member]
Dec. 31, 2011
Upper Limit [Member]
Dec. 31, 2010
Upper Limit [Member]
Dec. 31, 2009
Upper Limit [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]                            
Compensation cost that has been charged against income     $ 15,900,000 $ 15,500,000 $ 12,200,000                  
Share-based compensation arrangements portion of income tax benefit     5,600,000 5,400,000 4,300,000                  
Excess tax benefits classified as cash from financing activities     4,500,000 3,300,000 3,500,000                  
Maximum number of shares to be authorized             11,000,000       800,000      
Market value of common shares to be owned by Director by the end of a four-year period                     250,000      
Percentage of the target award pool that is granted based on performance                       200.00% 150.00% 150.00%
Number of shares granted under the Plan             307,940              
Share Based Compensation Arrangement Share Based Payment Award Additional Shares Authorized               18,720   67,009        
Committees targeted payout             12,480   44,673          
Nonemployee Directors annual retainer   60,000       24,000                
Nonemployee Directors annual equity award   80,000                        
Directors' annual retainer fee reduction 10.00%                          
Total compensation cost related to outstanding awards not yet recognized     $ 26,000,000                      
Weighted average remaining period for the awards outstanding (in years)   2.0 2.0                      
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Increase Decrease             500,000