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Share-Based Payments (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Issued During Period Shares 862,662 857,403 783,661
Number of options granted 0    
Stock Issued During Period Shares Dividend Reinvestment Plan 63,349 90,110 100,383
Expense charged $ 19.9 $ 13.8 $ 10.1
Corresponding income tax benefit 6.8 4.8 3.5
Omnibus Stock Plan [Member]
      
Maximum exercise period for an option grant 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,233,305    
Number of shares available in reserve 3,445,663    
DEUs accrued 23,505 32,558 41,469
DEU issuances 39,296 48,224 33,532
Cash Incentive Plan [Member]
      
Cash units granted, net of forfeiture 55,365 46,961 46,879
Stock Option II [Member]
      
Maximum exercise period for an option grant 10 years    
Number of shares available in reserve 298,680    
Stock Option III [Member]
      
Maximum exercise period for an option grant 10 years    
Number of shares available in reserve 275,244    
Stock Option Plan For Directors [Member]
      
Number of shares available in reserve 114,000    
Stock Compensation Plan For Non Employee Directors [Member]
      
Number of shares available in reserve 94,290    
Employee Stock Purchase Plan [Member]
      
Stock Issued During Period Shares 122,951 129,081 131,705
Number of shares available in reserve 870,930    
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 86,388 89,723 111,427
Number of shares available in reserve 2,098,020    
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 376,163 326,213 402,925
Stock Option [Member] | Stock Option Plan For Directors [Member]
      
Number of options granted 6,000