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v3.23.1

Stock Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2023 | Apr. 27, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 150,000,000 |  | 150,000,000
Total stock compensation expense |  |  | $ 14.0 | $ 7.0 |
Performance Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant-date fair value of performance awards granted (in dollars per share) |  |  | $ 144.24 | $ 124.12 |
Shares awarded (in shares) |  |  | 279,724 |  |
Share-based compensation cost not yet recognized |  |  | $ 65.0 |  |
Share-based compensation cost not yet recognized, period for recognition |  |  | 2 years |  |
Restricted Stock Unit Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant-date fair value of performance awards granted (in dollars per share) |  |  | $ 135.53 | $ 117.08 |
Shares awarded (in shares) |  |  | 100,835 |  |
Share-based compensation cost not yet recognized |  |  | $ 23.4 |  |
Share-based compensation cost not yet recognized, period for recognition |  |  | 1 year 6 months |  |
Shares received for every restricted stock unit award given |  |  | 1 |  |
Requisite service period |  |  | 3 years |  |
Restricted Stock Unit Awards | Certain Executives | 2020 Grants |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Restricted Stock Unit Awards | Vesting Year One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |
Restricted Stock Unit Awards | Vesting Year Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |
Restricted Stock Unit Awards | Vesting Year Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 33.33% |  |
Stock-Settled Appreciation Rights |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation cost not yet recognized |  |  | $ 0.2 |  |
Share-based compensation cost not yet recognized, period for recognition |  |  | 1 year |  |
Outstanding awards (in shares) |  |  | 102,009 |  |
Restricted Stock | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares awarded (in shares) |  | 12,069 |  |  |
Shares awarded after shares with held for taxes (in shares) |  | 10,524 |  |  |
Total stock compensation expense | $ 1.5 |  |  |  |
2006 Long Term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 10,000,000 |  |
Shares available for grant (in shares) |  |  | 3,586,952 |  |

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