Stock-Based Compensation (Components Of Stock-Based Compensation) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 26.5	$ 27.6	$ 30.1
Total tax benefits associated with stock-based compensation	3.6	4.9	5.3
To Be Settled With Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	19.3	18.6	19.5
Employee contributions for above stock plans	7.2	9.0	10.6
Total stock-based compensation	26.5	27.6	30.1
Total tax benefits associated with stock-based compensation	4.7	4.5	4.7
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	(1.1)	0.4	0.6
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)	3.7	3.0	3.7
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)	1.2	1.5	1.6
To Be Settled With Stock \| ESU program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	1.0	1.2	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)	0.7	0.7	0.8
To Be Settled With Stock \| PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	0.1	2.6	0.8
To Be Settled With Stock \| RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	11.8	8.8	10.2
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	0.8	1.0
To Be Settled In Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	(0.1)	1.3	(1.8)
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	0.7
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 \| 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 \| PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-related compensation expense (income)	(0.8)	0.6	(2.5)
To Be Settled In Cash \| RSU
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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