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Retirement Benefits
12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The Corporation has a defined contribution retirement plan covering substantially all members.

The Corporation’s contribution to the plan is based on member eligible earnings and/or member contributions. A portion of the contribution is also based on results of operations, and a portion is contributed in the form of common stock of the Corporation. The following table reconciles the annual contributions:
202220212020
Stock contribution$5.1 $7.1 $6.9 
Cash contribution25.1 17.8 19.9 
Total annual contribution$30.1 $25.0 $26.8