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Retirement Plans (Schedule of Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]    
Projected Benefit Obligation $ 445.7 $ 407.0
Accumulated Benefit Obligation 442.1 405.1
Fair Value of Plan Assets $ 326.4 $ 310.9