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Benefit Plans, Fair Values by Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value of Plan Assets [Abstract]    
Fair value of plan assets $ 285.4 $ 381.4
Equity Securities [Member]    
Fair Value of Plan Assets [Abstract]    
Fair value of plan assets 155.0 206.8
Fixed Income Securities [Member]    
Fair Value of Plan Assets [Abstract]    
Fair value of plan assets 91.9 116.5
Real Estate [Member]    
Fair Value of Plan Assets [Abstract]    
Fair value of plan assets 0.8 1.0
Other [Member]    
Fair Value of Plan Assets [Abstract]    
Fair value of plan assets $ 37.7 $ 57.1