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Share-Based Payments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Issued During Period Shares Share Based Compensation 783,661 433,271 435,571
Number of options granted 0    
Stock Issued During Period Shares Dividend Reinvestment Plan 100,383 106,437 123,880
Expense charged $ 10.1 $ 12.2 $ 10.8
Corresponding income tax benefit 3.5 4.0 3.4
Omnibus Stock Plan [Member]
      
Maximum exercise period for an option grant 10    
Number of shares available for grant 5,300,110    
DEUs accrued 41,469 38,392 32,088
DEU issuances 33,532    
Cash Incentive Plan [Member]
      
Cash units granted 46,879 45,082 46,349
Stock Option II [Member]
      
Maximum exercise period for an option grant 10    
Number of shares available for grant 302,680    
Stock Issued During Period Shares Dividend Reinvestment Plan   97  
Stock Forfeited During Period Shares Dividend Reinvestment Plan     679
Stock Option III [Member]
      
Maximum exercise period for an option grant 10    
Number of shares available for grant 397,212    
Stock Forfeited During Period Shares Dividend Reinvestment Plan     23,285
Stock Option Plan For Directors [Member]
      
Number of shares available for grant 210,000    
Stock Compensation Plan For Non Employee Directors [Member]
      
Stock Issued During Period Shares Share Based Compensation     960
Number of shares available for grant 94,290    
Employee Stock Purchase Plan [Member]
      
Stock Issued During Period Shares Share Based Compensation 131,705 149,258 190,845
Number of shares available for grant 1,122,962    
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 111,427 109,343 146,570
Number of shares available for grant 2,274,131    
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 402,925 374,153 520,011
Restricted Stocks [Member] | Omnibus Stock Plan [Member]
      
Stock forfeited   820 7,168
Restricted Stocks [Member] | Stock Option III [Member]
      
Stock forfeited     1,924
Stock Option [Member] | Omnibus Stock Plan [Member]
      
Number of options granted   238,790 313,811
Stock Option [Member] | Stock Option Plan For Directors [Member]
      
Number of options granted 6,000