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Stock-Based Compensation (Components Of Stock-Based Compensation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation $ 30.1 $ 34.2 $ 29.2
Recognized tax benefits on stock-based compensation expense 5.3 9.2 6.5
To Be Settled With Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 19.5 23.9 17.0
Employee contributions for above stock plans 10.6 10.3 12.2
Total stock-based compensation 30.1 34.2 29.2
Recognized tax benefits on stock-based compensation expense 4.7 5.8 4.0
To Be Settled With Stock | Accounting Standards Update 2016-13      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized tax benefits on stock-based compensation expense 0.6 3.4 2.5
To Be Settled With Stock | Stock-based retirement plans contributions      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 3.7 4.0 3.5
To Be Settled With Stock | Deferred Stock Compensation Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 1.6 1.5 2.2
To Be Settled With Stock | Stock-based retirement plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 1.4 1.1 1.4
To Be Settled With Stock | Discount Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 0.8 0.9 0.9
To Be Settled With Stock | Performance Stock Unit Awards - TSR Based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 2.5 3.1 3.2
To Be Settled With Stock | Performance Stock Unit Awards - EBIT CAGR Based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) (1.7) 4.7 (1.9)
To Be Settled With Stock | Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 10.2 8.2 6.8
To Be Settled With Stock | Other, primarily non-employee directors restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 1.0 0.4 0.9
To Be Settled In Cash      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) (1.8) 4.6 (2.0)
To Be Settled In Cash | Stock-based retirement plans contributions      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 0.7 0.6 0.7
To Be Settled In Cash | Deferred Stock Compensation Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 0.0 0.0 0.0
To Be Settled In Cash | Stock-based retirement plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 0.0 0.0 0.0
To Be Settled In Cash | Discount Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 0.0 0.0 0.0
To Be Settled In Cash | Performance Stock Unit Awards - TSR Based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) (0.5) (1.0) (0.7)
To Be Settled In Cash | Performance Stock Unit Awards - EBIT CAGR Based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) (2.0) 5.0 (2.0)
To Be Settled In Cash | Restricted Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) 0.0 0.0 0.0
To Be Settled In Cash | Other, primarily non-employee directors restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-related compensation expense (income) $ 0.0 $ 0.0 $ 0.0