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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

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