Stock-Based Compensation (Components Of Stock-Based Compensation) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 27.6	$ 30.1	$ 34.2
Total tax benefits associated with stock-based compensation	4.9	5.3	9.2
To Be Settled With Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	18.6	19.5	23.9
Employee contributions for above stock plans	9.0	10.6	10.3
Total stock-based compensation	27.6	30.1	34.2
Total tax benefits associated with stock-based compensation	4.5	4.7	5.8
To Be Settled With Stock \| Accounting Standards Update 2016-13
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total tax benefits associated with stock-based compensation	0.4	0.6	3.4
To Be Settled With Stock \| Executive Stock Unit (ESU) program contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	3.0	3.7	4.0
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)	1.5	1.6	1.5
To Be Settled With Stock \| ESU program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.2	1.4	1.1
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)	0.7	0.8	0.9
To Be Settled With Stock \| 2022 and prior PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.3	0.8	7.8
To Be Settled With Stock \| 2023 PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.3	0.0	0.0
To Be Settled With Stock \| Restricted Stock Unit (RSU) awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	8.8	10.2	8.2
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)	0.8	1.0	0.4
To Be Settled In Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.3	(1.8)	4.6
To Be Settled In Cash \| Executive Stock Unit (ESU) program contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.7	0.7	0.6
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 \| ESU 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 \| 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 \| 2022 and prior PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	(0.5)	(2.5)	4.0
To Be Settled In Cash \| 2023 PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.1	0.0	0.0
To Be Settled In Cash \| Restricted Stock Unit (RSU) 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

Employee contributions to stock compensation plans.

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