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Share-Based Payments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Issued During Period Shares Share Based Compensation 857,403,000 783,661,000 433,271,000
Number of options granted 0    
Stock Issued During Period Shares Dividend Reinvestment Plan 90,110,000 100,383,000 106,437,000
Expense charged $ 13.8 $ 10.1 $ 12.2
Corresponding income tax benefit 4.8 3.5 4.0
Omnibus Stock Plan [Member]
      
Maximum exercise period for an option grant 10 years    
Number of shares available for grant 4,765,511    
DEUs accrued 32,558 41,469 38,392
DEU issuances 48,224    
Cash Incentive Plan [Member]
      
Cash units granted 46,961 46,879 45,082
Stock Option II [Member]
      
Maximum exercise period for an option grant 10 years    
Number of shares available for grant 298,680    
Stock Issued During Period Shares Dividend Reinvestment Plan     97
Stock Option III [Member]
      
Maximum exercise period for an option grant 10 years    
Number of shares available for grant 351,212    
Stock Option Plan For Directors [Member]
      
Number of shares available for grant 156,000    
Stock Compensation Plan For Non Employee Directors [Member]
      
Number of shares available for grant 94,290    
Employee Stock Purchase Plan [Member]
      
Stock Issued During Period Shares Share Based Compensation 129,081 131,705 149,258
Number of shares available for grant 993,881    
Discount from market price, offering date 85.00%    
Discount from market price, purchase date 85.00%    
Agent Stock Purchase Plan [Member]
      
Stock Issued During Period Shares Share Based Compensation 89,723 111,427 109,343
Number of shares available for grant 2,184,408    
Discount from market price, purchase date 10.00%    
Expense charged 0.2 0.2 0.2
Corresponding income tax benefit $ 0.1 $ 0.1 $ 0.1
Restricted Stock Units (RSUs) [Member] | Omnibus Stock Plan [Member]
      
Number Of Restricted Stock Units Granted Net Of Forfeitures 326,213 402,925 374,153
Restricted Stocks [Member] | Omnibus Stock Plan [Member]
      
Stock forfeited     820
Stock Option [Member] | Omnibus Stock Plan [Member]
      
Number of options granted     238,790
Stock Option [Member] | Stock Option Plan For Directors [Member]
      
Number of options granted 6,000