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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Flexible Stock Plan Options | At December 31, 2023, the following common shares were authorized for issuance under the Plan:
| Shares Available for Issuance |  | Maximum Number of Authorized Shares
Unexercised options | .4 |  |  | .4 |
Outstanding stock units—vested | 3.5 |  |  | 9.6 |
Outstanding stock units—unvested | 1.0 |  |  | 2.9 |
Available for grant | 6.0 |  |  | 6.0 |
Authorized for issuance at December 31, 2023 | 10.9 |  |  | 18.9 |
Schedule of Components Of Stock-Based Compensation | The following table recaps the impact of stock-based compensation on the results of operations for each of the periods presented:
| Year Ended December 31
| 2023 |  | 2022 |  | 2021
| To Be Settled With Stock |  | To Be Settled In Cash |  | To Be Settled With Stock |  | To Be Settled In Cash |  | To Be Settled With Stock |  | To Be Settled In Cash
Executive Stock Unit (ESU) program contributions 1 | $ | 3.0 |  |  | $ | .7 |  |  | $ | 3.7 |  |  | $ | .7 |  |  | $ | 4.0 |  |  | $ | .6 |
Discounts on various stock awards: |  |  |  |  |  |  |  |  |  |  |
Deferred Stock Compensation Program 2 | 1.5 |  |  | — |  |  | 1.6 |  |  | — |  |  | 1.5 |  |  | — |
ESU program 1 | 1.2 |  |  | — |  |  | 1.4 |  |  | — |  |  | 1.1 |  |  | — |
Discount Stock Plan 3 | .7 |  |  | — |  |  | .8 |  |  | — |  |  | .9 |  |  | — |
Performance Stock Unit (PSU) awards: 4 |  |  |  |  |  |  |  |  |  |  |
2023 PSU awards 4A | 1.3 |  |  | 1.1 |  |  | — |  |  | — |  |  | — |  |  | — |
2022 and prior PSU awards 4B | 1.3 |  |  | (.5) |  |  | .8 |  |  | (2.5) |  |  | 7.8 |  |  | 4.0 |
Restricted Stock Unit (RSU) awards 5 | 8.8 |  |  | — |  |  | 10.2 |  |  | — |  |  | 8.2 |  |  | — |
Other, primarily non-employee directors restricted stock | .8 |  |  | — |  |  | 1.0 |  |  | — |  |  | .4 |  |  | — |
Total stock-related compensation expense (income) | 18.6 |  |  | $ | 1.3 |  |  | 19.5 |  |  | $ | (1.8) |  |  | 23.9 |  |  | $ | 4.6 |
Employee contributions for above stock plans | 9.0 |  |  |  |  | 10.6 |  |  |  |  | 10.3 |  |  |
Total stock-based compensation | $ | 27.6 |  |  |  |  | $ | 30.1 |  |  |  |  | $ | 34.2 |  |  |
Tax benefits on stock-based compensation expense | $ | 4.5 |  |  |  |  | $ | 4.7 |  |  |  |  | $ | 5.8 |  |  |
Tax benefits on stock-based compensation payments | .4 |  |  |  |  | .6 |  |  |  |  | 3.4 |  |  |
Total tax benefits associated with stock-based compensation | $ | 4.9 |  |  |  |  | $ | 5.3 |  |  |  |  | $ | 9.2 |  |  |
Schedule of Stock-based Compensation Assets and Liabilities | The following table recaps the impact of stock-based compensation on assets and liabilities for each of the periods presented:
| 2023 |  | 2022
| Current |  | Long-term |  | Total |  | Current |  | Long-term |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |
Diversified investments associated with the ESU program 1 | $ | 3.6 |  |  | $ | 46.8 |  |  | $ | 50.4 |  |  | $ | 3.1 |  |  | $ | 39.7 |  |  | $ | 42.8 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
ESU program 1 | $ | 3.7 |  |  | $ | 48.7 |  |  | $ | 52.4 |  |  | $ | 3.1 |  |  | $ | 40.9 |  |  | $ | 44.0 |
PSU awards 4 | .1 |  |  | 1.8 |  |  | 1.9 |  |  | — |  |  | 1.3 |  |  | 1.3 |
Other - primarily timing differences between employee withholdings and related employer contributions to be submitted to various plans' trust accounts | 5.5 |  |  | — |  |  | 5.5 |  |  | 5.9 |  |  | — |  |  | 5.9 |
Total liabilities associated with stock-based compensation | $ | 9.3 |  |  | $ | 50.5 |  |  | $ | 59.8 |  |  | $ | 9.0 |  |  | $ | 42.2 |  |  | $ | 51.2 |
Schedule of Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits |
| Options |  | Units |  | Cash
Aggregate amount of compensation deferred during 2023 | $ | .1 |  |  | $ | 4.3 |  |  | $ | .6 |
Schedule of Discount Stock Plan |
Average 2023 purchase price per share (net of discount) | $ | 25.37 |
2023 number of shares purchased by employees | .2 |
Shares purchased since inception in 1982 | 24.0 |
Maximum shares under the plan | 27.0 |
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Performance Based Units Table | Below is a summary of shares and grant date fair value related to PSU awards for the periods presented:
| Year Ended December 31
| 2023 |  | 2022 |  | 2021
2023 awards and prior year TSR Based awards |  |  |  |  |
Total shares base award | .1 |  |  | .1 |  |  | .1 |
Grant date per share fair value | $ | 29.31 |  |  | $ | 41.13 |  |  | $ | 49.43 |
Risk-free interest rate | 4.4 | % |  | 1.7 | % |  | .2 | %
Vesting period in years | 3.0 |  | 3.0 |  | 3.0
Expected volatility | 45.7 | % |  | 45.2 | % |  | 44.3 | %
Expected dividend yield | 5.5 | % |  | 4.6 | % |  | 3.7 | %
Prior year EBIT CAGR Based awards |  |  |  |  |
Total shares base award | — |  |  | .1 |  |  | .1 |
Grant date per share fair value | $ | — |  |  | $ | 32.88 |  |  | $ | 38.77 |
Vesting period in years | 0.0 |  | 3.0 |  | 3.0
Three-Year Performance Cycle for PSU - EBIT CAGR Based
Award Year |  | Completion Date |  |  | Payout as a Percent of the Base Award |  | Number of Shares Distributed |  | Cash Portion |  | Distribution Date
2019 |  | December 31, 2021 |  |  | 127.0% |  | <.1 million |  | $ | 3.5 |  |  | First quarter 2022
2020 |  | December 31, 2022 |  |  | —% |  | — million |  | $ | — |  |  | First quarter 2023
2021 |  | December 31, 2023 |  |  | 6.0% |  | <.1 million |  | $ | .1 |  |  | First quarter 2024
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | Stock unit information for the plans discussed above is presented in the table below:
| DSU |  | ESU |  | PSU |  | RSU |  |  |  | Total Units |  | Weighted Average Grant Date Fair Value per Unit |  | Aggregate Intrinsic Value
Unvested at December 31, 2022 | — |  |  | — |  |  | .8 |  |  | .2 |  |  |  |  | 1.0 |  |  | $ | 42.34 |  |  |
Granted based on current service | .2 |  |  | .3 |  |  | — |  |  | .4 |  |  |  |  | .9 |  |  | 29.74 |  |  |
Granted based on future conditions* | — |  |  | — |  |  | .3 |  |  | — |  |  |  |  | .3 |  |  | 14.66 |  |  |
Vested | (.2) |  |  | (.3) |  |  | — |  |  | (.3) |  |  |  |  | (.8) |  |  | 30.39 |  |  |
Forfeited* | — |  |  | — |  |  | (.3) |  |  | (.1) |  |  |  |  | (.4) |  |  | 23.95 |  |  |
Unvested at December 31, 2023 | — |  |  | — |  |  | .8 |  |  | .2 |  |  |  |  | 1.0 |  |  | $ | 42.38 |  |  | $ | 25.5 |
Fully vested shares available for issuance at December 31, 2023 |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  | $ | 92.3 |
*PSU awards are presented at maximum payout of 200% at grant date and when forfeited.
Schedule of Stock Units Converted to Common Stock |
| Year Ended December 31
| 2023 |  | 2022 |  | 2021
Total intrinsic value of vested stock units converted to common stock | $ | 1.9 |  |  | $ | 5.7 |  |  | $ | 10.5 |

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