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Stock Plans and Management Compensation (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ 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] |  |  |
Number of Shares Available for Grant (in shares) | 3,600 |  |
Non-Vested Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age of Grantee |  | 62 years |
Share-Based Compensation Expense | $ 20.4 | $ 18.2 | $ 16.3
Share-Based Compensation Expense, Tax Benefit | 5.0 | 4.5 | 4.0
Fair Value of Shares Vested During the Period | $ 24.5 | $ 16.7 | $ 11.3
Weighted Average Grant Date Fair Value | $ 90.72 | $ 82.14 |
Awarded - Weighted Average Grant Date Fair Value | 88.00 | $ 93.62 | $ 91.14
Forfeited - Weighted Average Grant Date Fair Value | 86.54 |  |
Vested - Weighted Average Grant Date Fair Value | $ 68.17 |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Outstanding at January 1 | 601 |  |
Awarded | 278 |  |
Forfeited | (49) |  |
Vested | (253) |  |
Outstanding at December 31 | 577 | 601 |
Unrecognized Compensation Cost | $ 14.2 |  |
Non-Vested Stock Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Age of Grantee plus Grantees Total Number of Years of Service | 70 years |  |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-Based Compensation Expense | $ 2.1 | $ 3.6 | $ 13.5
Share-Based Compensation Expense, Tax Benefit | 0.5 | 0.9 | 3.3
Fair Value of Shares Vested During the Period | $ 16.2 | $ 14.6 | $ 18.6
Weighted Average Grant Date Fair Value | $ 90.09 | $ 90.97 |
Awarded - Weighted Average Grant Date Fair Value | 78.49 |  |
Forfeited - Weighted Average Grant Date Fair Value | 87.15 |  |
Vested - Weighted Average Grant Date Fair Value | $ 77.02 |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] |  |  |
Outstanding at January 1 | 191 |  |
Awarded | 206 |  |
Forfeited | (13) |  |
Vested | (167) |  |
Outstanding at December 31 | 217 | 191 |
Unrecognized Compensation Cost | $ 1.3 |  |

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