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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value of Plan Assets [Abstract]
Fair value of plan assets	$ 317.4	$ 285.4
Equity Securities [Member]
Fair Value of Plan Assets [Abstract]
Fair value of plan assets	162.9	155.0
Fixed Income Securities [Member]
Fair Value of Plan Assets [Abstract]
Fair value of plan assets	112.0	91.9
Real Estate [Member]
Fair Value of Plan Assets [Abstract]
Fair value of plan assets	0.8	0.8
Other [Member]
Fair Value of Plan Assets [Abstract]
Fair value of plan assets	$ 41.7	$ 37.7

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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