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Employee and Agent Benefits - Benefit Obligation and Funded Status (Details) - Other postretirement benefits $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 780.6 | $ 732.8
Actual return on plan assets | (2.9) | 53.1
Employer contribution | 1.1 | 1.5
Participant contributions | 4.6 | 6.0
Benefits paid | (10.2) | (12.8)
Assets re-designated for non-retiree benefits | (656.5) |
Fair value of plan assets at end of year | 116.7 | 780.6
Amount recognized in statement of financial position |  |
Amount recognized in other assets | 11.7 | 675.5
Amount recognized in other liabilities | (1.8) | (2.9)
Total assets (liabilities) recognized in statement of financial position | $ 9.9 | $ 672.6

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