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Accumulated Other Comprehensive Loss (Reclassification Adjustments From AOCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amortization of benefit plans to net income $ (0.5) $ (0.4) $ (0.1)
Income tax 0.1 0.1 0.0
Benefit Plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total, net of tax (0.4) (0.3) (0.1)
Actuarial loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amortization of benefit plans to net income (0.7) (0.8) (0.6)
Prior service benefit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amortization of benefit plans to net income $ 0.2 $ 0.4 $ 0.5