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Stock Plans and Management Compensation (Details 3) - 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, 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 | $ 3.6 | $ 13.5 | $ 13.8
Share-Based Compensation Expense, Tax Benefit | 0.9 | 3.3 | 3.4
Fair Value of Shares Vested During the Period | $ 14.6 | $ 18.6 | $ 3.4
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding at January 1 | 192,000 |  |
Awarded Grants in Period | 207,000 |  |
Forfeited | (5,000) |  |
Vested | (203,000) |  |
Outstanding at December 31 | 191,000 | 192,000 |
Weighted Average Grant Date Fair Value | $ 90.97 | $ 76.15 |
Awarded - Weighted Average Grant Date Fair Value | 70.32 |  |
Forfeited - Weighted Average Grant Date Fair Value | 81.31 |  |
Vested - Weighted Average Grant Date Fair Value | $ 56.11 |  |
Unrecognized Compensation Cost | $ 3.3 |  |
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 | $ 18.2 | $ 16.3 | $ 13.3
Share-Based Compensation Expense, Tax Benefit | 4.5 | 4.0 | 3.3
Fair Value of Shares Vested During the Period | $ 16.7 | $ 11.3 | $ 6.6
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding at January 1 | 635,000 |  |
Awarded Grants in Period | 226,000 |  |
Forfeited | (28,000) |  |
Vested | (232,000) |  |
Outstanding at December 31 | 601,000 | 635,000 |
Weighted Average Grant Date Fair Value | $ 82.14 | $ 66.81 |
Awarded - Weighted Average Grant Date Fair Value | 93.62 | $ 91.14 | $ 64.13
Forfeited - Weighted Average Grant Date Fair Value | 83.15 |  |
Vested - Weighted Average Grant Date Fair Value | $ 51.32 |  |
Unrecognized Compensation Cost | $ 12.5 |  |
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) | $ 91.62 | $ 87.48 | $ 61.91
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Awarded Grants in Period | 24,320 | 24,560 | 26,750
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) | $ 94.59 | $ 91.44 | $ 64.72
Risk-Free Interest Rate | 1.70% | 0.20% | 1.40%
Dividend Yield | 1.50% | 1.20% | 1.50%
Volatility Factor | 54.80% | 65.60% | 46.60%

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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Data Type: | na
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