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Stock Plans and Management Compensation (Details 3) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Percentage of Premium Paid Out in Deferred Company Common Stock | 20.00% |  |
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
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding at January 1 | 191,000 |  |
Awarded Grants in Period | 206,000 |  |
Forfeited | (13,000) |  |
Vested | (167,000) |  |
Outstanding at December 31 | 217,000 | 191,000 |
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 |  |
Unrecognized Compensation Cost | $ 1.3 |  |
Unrecognized Compensation Cost, Period for Recognition | 1 year 6 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 2 years 10 months 24 days | 2 years 10 months 24 days | 2 years 10 months 24 days
Non-Vested Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
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
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding at January 1 | 601,000 |  |
Awarded Grants in Period | 278,000 |  |
Forfeited | (49,000) |  |
Vested | (253,000) |  |
Outstanding at December 31 | 577,000 | 601,000 |
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 |  |
Unrecognized Compensation Cost | $ 14.2 |  |
Age of Grantee |  | 62 years |
Unrecognized Compensation Cost, Period for Recognition | 1 year 2 months 12 days |  |
Awards Vesting Period (in years) | 3 years |  |
Stock Options and SAR's [Member] |  |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Period for Stock Options and SARs to be Exercisable (in years) | 10 years |  |
Awards Vesting Period (in years) | 4 years |  |
Outstanding on December 31 | 1 month 6 days |  |
Exercisable and Vested on December 31 | 1 month 6 days |  |
Vested and Expected to Vest on December 31 | 1 month 6 days |  |
Stock Options and SAR's [Member] | $23.79 [Member] |  |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) | 1 year 1 month 6 days |  |
Stock Options and SAR's [Member] | Greater Than $14.68 [Member] |  |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) | 1 month 6 days |  |
Stock Options and SAR's [Member] | $5.87 to $14.68 [Member] |  |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) | 8 months 12 days |  |
Stock Options and SAR's [Member] | $5.86 [Member] |  |  |
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding Options, Weighted Average Remaining Years of Contractual Life (in years) | 0 years |  |
Share-based Payment Arrangement, Tranche Two [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted Average Price at Grant Date (in dollars per share) | $ 83.97 | $ 91.62 | $ 87.48
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Awarded Grants in Period | 36,170 | 24,320 | 24,560
Share-based Payment Arrangement, Tranche One [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted Average Price at Grant Date (in dollars per share) | $ 88.47 | $ 94.59 | $ 91.44
Risk-Free Interest Rate | 4.30% | 1.70% | 0.20%
Dividend Yield | 1.80% | 1.50% | 1.20%
Volatility Factor | 49.80% | 54.80% | 65.60%

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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