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Employee and Agent Benefits - Pension Plan Changes and Plan Gains/Losses (Details) - Pension benefits - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2020
Jun. 30, 2020
Contributions      
Contributions made by employer to fund qualified and nonqualified pension plans   $ 15.7 $ 21.4
Maximum      
Contributions      
Amount of possible contributions to be made during the current fiscal year to the qualified and nonqualified pension plans combined   $ 75.0 $ 75.0
Nonqualified benefit plans      
Components of Net Periodic Benefit Cost (Income)      
Actuarial gain (loss) $ (59.0)    
Total plan amendment gain 122.4    
Increase in benefit obligation 237.6    
Asset gain on plan assets $ 178.6