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Employee and Agent Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2011
Pension benefits
Dec. 31, 2010
Pension benefits
Dec. 31, 2009
Pension benefits
Dec. 31, 2011
Other postretirement benefits
Dec. 31, 2010
Other postretirement benefits
Dec. 31, 2009
Other postretirement benefits
Dec. 31, 2011
Medical plans
Dec. 31, 2011
Life plans
Dec. 31, 2011
Long-term care plans
Sep. 30, 2010
Retiree health benefits
Dec. 31, 2010
Retiree health benefits
Dec. 31, 2011
Retiree health benefits
Effect of one-percentage-point change in assumed health care cost trend rates                        
Effect on total of service cost and interest cost components of a one-percentage-point increase in assumed health care cost trend rates       $ 0.6                
Effect on total of service cost and interest cost components of a one-percentage-point decrease in assumed health care cost trend rates       (0.6)                
Effect on accumulated postretirement benefit obligation of a one-percentage-point increase in assumed health care cost trend rates       (9.4)                
Effect on accumulated postretirement benefit obligation of a one-percentage-point decrease in assumed health care cost trend rates       8.2                
Impact of Amendment to Retiree Health Benefits                        
Company-paid subsidy for pre-Medicare-eligible coverage (as a percent)                       40.00%
Reduction in net periodic benefit cost resulting from plan amendment and remeasurement                     14.0  
Plan amendment         $ 153.6         $ 153.6    
Weighted-average assumptions used to determine benefit obligations as disclosed under the Obligations and Funded Status section                        
Discount rate: Benefit obligation (as a percent) 5.15% 5.65%   5.15% 5.65%         5.40%    
Rate of compensation increase: Benefit obligation (as a percent) 5.00% 5.00%   5.00% 5.00%              
Weighted-average assumptions used to determine net periodic benefit cost                        
Discount rate: Net periodic benefit cost (as a percent) 5.65% 6.00% 6.00% 5.65% 6.00% 6.00%            
Expected long-term return on plan assets: Net periodic benefit cost (as a percent) 8.00% 8.00% 8.00% 7.30% 7.30% 7.30% 7.25% 7.75% 5.85% 7.25%    
Rate of compensation increase: Net periodic benefit cost (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%            
Assumed Health Care Cost Trend Rates                        
Health care cost trend rate assumed for next year under age 65 (as a percent)       9.50% 9.50%         9.50%    
Health care cost trend rate assumed for next year age 65 and over (as a percent)       9.00% 9.00%         9.00%    
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)       5.00% 5.00%         5.00%    
Year that the health care cost trend rate reaches the ultimate trend rate (calendar year)       2023 2022         2022