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Employee and Agent Benefits - Benefit Obligation and Funded Status (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Change in plan assets    
Fair value of plan assets at beginning of year $ 780.6 $ 732.8
Actual return on plan assets (6.4) 53.1
Employer contribution 0.4 1.5
Participant contributions 1.5 6.0
Benefits paid (3.6) (12.8)
Assets re-designated for non-retiree benefits (656.5)  
Fair value of plan assets at end of year 116.0 780.6
Amount recognized in statement of financial position    
Other assets 11.3 675.5
Other liabilities (3.4) (2.9)
Total assets (liabilities) recognized in statement of financial position $ 7.9 $ 672.6