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Retirement Benefits Plans (Cumulative Amounts Not Yet Recognized in Net Income) (Details) - Postretirement benefit plans - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Cumulative amounts not yet recognized in net income:    
Actuarial losses $ 5.2 $ 10.0
Prior service benefits (0.8) (1.1)
Accumulated other comprehensive loss (before related tax benefit) $ 4.4 $ 8.9