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Share-Based Awards (Details - Other Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
[ShareOptionsMember]
Dec. 31, 2011
[ShareOptionsMember]
Dec. 31, 2010
[ShareOptionsMember]
Dec. 31, 2012
[ShareSettledShareAppreciationRightsMember]
Dec. 31, 2011
[ShareSettledShareAppreciationRightsMember]
Dec. 31, 2010
[ShareSettledShareAppreciationRightsMember]
Dec. 31, 2012
[ReplacementAwardsWarrantsMember]
Dec. 31, 2009
[ReplacementAwardsWarrantsMember]
Dec. 31, 2012
[RestrictedShareUnitsMember]
Dec. 31, 2011
[RestrictedShareUnitsMember]
Dec. 31, 2010
[RestrictedShareUnitsMember]
Dec. 31, 2012
[EmployeeEquityPlanMember]
Dec. 31, 2012
[ShareOptionsAndShareSettledShareAppreciationRightsMember]
Dec. 31, 2012
[RestrictedShareUnitsAndPerformanceShareUnitsMember]
Share Based Compensation Arrangements - Other details                                  
Weighted average grant date fair value             $ 7.34 $ 10.32 $ 10.45     $ 65.33 $ 81.20 $ 79.18      
Fair value of units vested                       $ 5.5 $ 18.3 $ 30.9      
Unrecognized share-based compensation expense             2.9         23.4          
Weighted average period of recognition             1 year 10 months 0 days         1 year 10 months 0 days          
Weighted average remaining contractual term                   2 years 1 month 0 days              
Weighted average exercise price, exercises during period                   $ 33.59              
Weighted average exercise price                   $ 33.26              
Share based compensation expense 26.8 24.2 33.5                            
Tax benefit of share-based compensation expense 3.6 2.4 3.4                            
Tax Benefit Realized from Exercise of Stock Options 1.6 3.1 5.9                            
RSUs subject to delivery date restrictions                       15,388          
Restriction on sale or transfer, in years                       5 years 0 months 0 days          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward                                  
Outstanding at beginning of year             1,515,207         695,744          
Granted             356,900 210,582 450,568   27,655 294,184 314,182 374,366      
Released                   4,027   (83,650)          
Exercised             (17,313)                    
Forfeited or expired             (34,200)                    
Forfeited                       (36,783)          
Outstanding at end of year             1,820,594 1,515,207   11,243   869,495 695,744        
Exercisable             1,208,495                    
Assumptions:                                  
Expected life       6 years 0 months 0 days 6 years 0 months 0 days 6 years 0 months 0 days 6 years 0 months 0 days 6 years 0 months 0 days 6 years 0 months 0 days                
Expected volatility       17.70% 14.90% 15.80% 17.60% 15.60% 15.80%                
Risk-free interest rate       1.00% 2.00% 2.80% 1.10% 2.70% 2.80%                
Dividend yield       2.70% 2.70% 2.70% 2.80% 2.80% 2.70%                
Employee Equity Plan [Line Items]                                  
Maximum individual award in unit terms                             500,000    
Maximum individual award in dollar terms                             $ 5    
Total shares authorized under the plan                             8,300,000 4,900,000 3,400,000
Vesting period for EEP shares                               3 years 0 months 0 days 3 years 0 months 0 days
Shares remaining for issuance                             4,800,000 3,000,000 1,800,000
Contractual term, in years                               10 years 0 months 0 days