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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option award expense | $ 5.1 | $ 6.2 | $ 6.6
Weighted-average fair value of options granted during period | $ 32.51 | $ 20.82 | $ 15.18
Fair value of shares vested | $ 5.6 | $ 6.3 | $ 6.2
Total intrinsic value of options exercised | 11.8 | 36.4 | 4.1
Aggregate intrinsic value of exercisable options | 26.5 | 33.9 | 29.5
Cash received from options exercised | 22.8 | 26.4 | 8.9
Tax benefit realized for tax deductions from exercise of options | 1.8 | 5.5 | 0.5
Total future compensation costs related to unvested share-based awards | $ 6.1 |  |
Weighted average of shares for total future compensation cost related to unvested share-based awards | 1 year 3 months |  |
Tax (detriment) benefit for vesting of restricted share units | $ 1.2 | (0.1) | (0.1)
Restricted Stock And Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option award expense | $ 19.1 | $ 18.7 | $ 15.7
Vesting payout cap | 100.00% |  |
Period of time to measure Company total shareholder return and apply vesting payout cap (in years) | 3 years |  |
Total future compensation costs related to restricted share units and performance-based restricted share unit awards | $ 30.3 |  |
Weighted average period for unvested share-based RSUs to be recognized | 1 year 11 months 8 days |  |
Restricted Stock And Restricted Stock Units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting payout potential range | 0.00% |  |
Restricted Stock And Restricted Stock Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting payout potential range | 200.00% |  |
Options Exercisable After First Year | Share-based Payment Arrangement |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 25.00% |  |
Options Exercisable After First Year | Restricted Stock And Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 25.00% |  |
Options Exercisable After Second Year | Share-based Payment Arrangement |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 50.00% |  |
Options Exercisable After Second Year | Restricted Stock And Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 50.00% |  |
Options Exercisable After Third Year | Share-based Payment Arrangement |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 75.00% |  |
Options Exercisable After Third Year | Restricted Stock And Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 75.00% |  |
Options Exercisable After Fourth Year | Share-based Payment Arrangement |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 100.00% |  |
Options Exercisable After Fourth Year | Restricted Stock And Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable rate | 100.00% |  |
2013 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 9,500,000 |  |
2018 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 6,500,000 |  |
2021 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 4,710,000 |  |

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