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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Summary of Components of Stock-Based and Stock-Related Compensation | The following table recaps the impact of stock-based compensation on the results of operations for each of the periods presented:
| Six Months Ended June 30, 2024 |  | Six Months Ended June 30, 2023
| 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 matching contributions | $ | 1.6 |  |  | $ | .3 |  |  | $ | 1.8 |  |  | $ | .3 |
Discounts on various stock awards | 1.8 |  |  | — |  |  | 1.8 |  |  | — |
Performance Stock Unit awards | .2 |  |  | (.7) |  |  | 1.9 |  |  | .8 |
Restricted Stock Unit awards | 9.2 |  |  | — |  |  | 6.1 |  |  | — |
Other, primarily non-employee directors restricted stock | 1.1 |  |  | — |  |  | .9 |  |  | — |
Total stock-based compensation expense (income) | 13.9 |  |  | $ | (.4) |  |  | 12.5 |  |  | $ | 1.1 |
Employee contributions for above stock plans | 3.9 |  |  |  |  | 4.0 |  |  |
Total stock-based compensation | $ | 17.8 |  |  |  |  | $ | 16.5 |  |  |
Tax benefits on stock-based compensation expense | $ | 3.4 |  |  |  |  | $ | 3.0 |  |  |
Tax (expense)/benefits on stock-based compensation payments | (1.2) |  |  |  |  | .3 |  |  |
Total tax benefits associated with stock-based compensation | $ | 2.2 |  |  |  |  | $ | 3.3 |  |  |
| Three Months Ended |  | Three Months Ended
| June 30, 2024 |  | June 30, 2023
| 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 matching contributions | $ | 1.0 |  |  | $ | .1 |  |  | $ | 1.1 |  |  | $ | .2 |
Discounts on various stock awards | .9 |  |  | — |  |  | 1.1 |  |  | — |
Performance Stock Unit awards | .4 |  |  | (.2) |  |  | .8 |  |  | .1 |
Restricted Stock Unit awards | 2.9 |  |  | — |  |  | .8 |  |  | — |
Other, primarily non-employee directors restricted stock | .7 |  |  | — |  |  | .5 |  |  | — |
Total stock-based compensation expense (income) | 5.9 |  |  | $ | (.1) |  |  | 4.3 |  |  | $ | .3 |
Employee contributions for above stock plans | 1.9 |  |  |  |  | 2.5 |  |  |
Total stock-based compensation | $ | 7.8 |  |  |  |  | $ | 6.8 |  |  |
Tax benefits on stock-based compensation expense | $ | 1.4 |  |  |  |  | $ | 1.0 |  |  |
Tax (expense)/benefits on stock-based compensation | (.4) |  |  |  |  | — |  |  |
Total tax benefits associated with stock-based compensation | $ | 1.0 |  |  |  |  | $ | 1.0 |  |  |

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