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Stock Plans and Management Compensation (Details 3) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Excess Tax Benefit from Share-Based Compensation, Financing Activities | $ 1.8 | $ 1.1 | $ 2.8
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 | $ 13.5 | 13.8 | 6.4
Share-Based Compensation Expense, Tax Benefit | 3.3 | 3.4 | 1.6
Fair Value of Shares Vested During the Period | $ 18.6 | $ 3.4 | $ 4.9
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding at January 1 | 212,000 |  |
Awarded Grants in Period | 166,000 |  |
Forfeited | (1,000) |  |
Vested | (185,000) |  |
Outstanding at December 31 | 192,000 | 212,000 |
Weighted Average Grant Date Fair Value | $ 76.15 | $ 55.71 |
Awarded - Weighted Average Grant Date Fair Value | 76.89 |  |
Forfeited - Weighted Average Grant Date Fair Value | 87.48 |  |
Vested - Weighted Average Grant Date Fair Value | $ 53.35 |  |
Unrecognized Compensation Cost | $ 6.4 |  |
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 | $ 16.3 | $ 13.3 | $ 10.9
Share-Based Compensation Expense, Tax Benefit | 4.0 | 3.3 | 2.7
Fair Value of Shares Vested During the Period | $ 11.3 | $ 6.6 | $ 19.2
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Outstanding at January 1 | 571,000 |  |
Awarded Grants in Period | 190,000 |  |
Forfeited | (14,000) |  |
Vested | (112,000) |  |
Outstanding at December 31 | 635,000 | 571,000 |
Weighted Average Grant Date Fair Value | $ 66.81 | $ 57.31 |
Awarded - Weighted Average Grant Date Fair Value | 91.14 | $ 64.13 | $ 49.12
Forfeited - Weighted Average Grant Date Fair Value | 66.39 |  |
Vested - Weighted Average Grant Date Fair Value | $ 59.71 |  |
Unrecognized Compensation Cost | $ 12.0 |  |
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] |  |  |
Age of Grantee |  | 62 years |
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) | $ 87.48 | $ 61.91 | $ 47.61
Share-Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Awarded Grants in Period | 24,560 | 26,750 | 24,605
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) | $ 91.44 | $ 64.72 | $ 49.64
Risk-Free Interest Rate | 0.20% | 1.40% | 2.90%
Dividend Yield | 1.20% | 1.50% | 1.70%
Volatility Factor | 65.60% | 46.60% | 41.00%

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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