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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]    
Restricted Stock or Unit Expense $ 0.5 $ 0.4
Stock or Unit Option Plan Expense 0.1 0.1
Stock Appreciation Rights Expense 11.6 6.6
Allocated Share-based Compensation Expense 12.2 7.1
Share-based Payment Arrangement, Expense, Tax Benefit $ (1.5) $ 0.0