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Current expected payout of performance condition awards based on company performance relative to established internal metrics.

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Share Based Goods and Nonemployee Services Transaction Aggregate Shares Granted

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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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.

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Number of shares authorized for issuance under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Equity and Cash Incentive Program (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation expense [Abstract]
Pre-tax compensation expense	$ 25,026	$ 29,702	$ 23,698
Tax benefit	(2,731)	(2,490)	(2,722)
Total stock-based compensation expense, net of tax	$ 22,295	$ 27,212	$ 20,976
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	17,000,000
Vesting period (in years)	3 years
Award term	10 years
Shares Granted to Directors [Abstract]
Share Based Goods and Nonemployee Services Transaction Aggregate Shares Granted	9,854	10,838	15,802
Shares deferred	(6,278)	(6,168)	(9,917)
Net shares granted	3,576	4,670	5,885
Stock Appreciation Rights (SARs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Additional awards issued due to modification			1,138,008
Risk-free interest rate (in hundredths)	1.44%	2.51%
Dividend yield (in hundredths)	1.65%	2.13%
Expected life (in years)	5 years 6 months	5 years 7 months 6 days
Volatility (in hundredths)	22.76%	22.35%
Grant price	$ 119.86	$ 91.20
Fair value on date of grant	$ 22.54	$ 17.55
Awards Outstanding [Roll Forward]
Awards Outstanding (in number of shares)	2,979,933	3,599,169
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	390,780	615,089	757,603
Awards Forfeit and Expired (in number of shares)	(17,103)
Awards Exercised (in number of shares)	(992,913)
Awards Exercisable (in number of shares)	1,385,683
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Awards Outstanding, Weighted Average Exercise Price	$ 79.36	$ 69.07
Grant price	119.86	$ 91.20
Awards Forfeit and Expired, Weighted Average Exercise Price	91.98
Awards Exercised, Weighted Average Exercise Price	57.49
Awards Exercisable, Weighted Average Exercise Price	$ 62.59
Additional Disclosures [Abstract]
Awards Outstanding, Weighted Average Remaining Contractual Term	6 years 4 months 24 days
Awards Exercisable, Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Fair value of stock appreciation rights which became exerciable during the year	$ 8,585	$ 8,611	$ 12,832
Awards Exercised, Total Intrinsic Value	$ 55,031	$ 89,473	$ 101,365
Unvested Awards [Roll Forward]
Awards Granted (in number of shares)	390,780	615,089	757,603
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant	$ 22.54	$ 17.55
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	$ 8,746
Unrecognized Compensation Expense, Period for Recognition	1 year 7 months 6 days
Shares Granted to Directors [Abstract]
Fair value on date of grant	$ 22.54	$ 17.55
Performance Shares [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Additional awards issued due to modification			26,316
Risk-free interest rate (in hundredths)	1.40%
Dividend yield (in hundredths)	1.65%
Expected life (in years)	2 years 10 months 24 days
Volatility (in hundredths)	23.30%
Grant price	$ 119.86
Fair value on date of grant	$ 165.71
Awards Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	49,056	35,172	122,459
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Grant price	$ 119.86
Unvested Awards [Roll Forward]
Awards Unvested (in number of shares)	77,979	137,809
Awards Granted (in number of shares)	49,056	35,172	122,459
Awards Vested (in number of shares)	(108,886)
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Awards Unvested, Weighted Average Grant Date Fair Value	$ 138.14	$ 82.45
Fair value on date of grant	165.71
Awards Vested, Weighted Average Grant Date Fair Value	$ 80.08
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	$ 7,402
Unrecognized Compensation Expense, Period for Recognition	1 year 9 months 18 days
Shares Granted to Directors [Abstract]
Performance Share Attainment		191.20%	186.10%
Fair value on date of grant	$ 165.71
Restricted Stock Units (RSUs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Additional awards issued due to modification			47,063
Fair value on date of grant	$ 119.86	$ 91.20
Awards Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	83,512	124,929	284,721
Unvested Awards [Roll Forward]
Awards Unvested (in number of shares)	252,907	324,553
Awards Granted (in number of shares)	83,512	124,929	284,721
Forfeited awards (in number of shares)	11,140
Awards Vested (in number of shares)	(144,018)
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Awards Unvested, Weighted Average Grant Date Fair Value	$ 93.43	$ 81.45
Fair value on date of grant	119.86	91.20
Awards Forfeit, Weighted Average Grant Date Fair Value	96.26
Awards Vested, Weighted Average Grant Date Fair Value	$ 81.16
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	$ 14,943
Unrecognized Compensation Expense, Period for Recognition	1 year 3 months 18 days
Shares Granted to Directors [Abstract]
Fair value on date of grant	$ 119.86	91.20
Minimum [Member] \| Stock Appreciation Rights (SARs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate (in hundredths)			2.58%
Dividend yield (in hundredths)			1.99%
Expected life (in years)			5 years 7 months 6 days
Volatility (in hundredths)			20.95%
Grant price			$ 79.75
Fair value on date of grant			14.58
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Grant price			79.75
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant			14.58
Shares Granted to Directors [Abstract]
Fair value on date of grant			14.58
Minimum [Member] \| Performance Shares [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Fair value on date of grant			79.75
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant			79.75
Shares Granted to Directors [Abstract]
Fair value on date of grant			79.75
Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Fair value on date of grant			79.75
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant			79.75
Shares Granted to Directors [Abstract]
Fair value on date of grant			$ 79.75
Maximum [Member] \| Stock Appreciation Rights (SARs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate (in hundredths)			2.87%
Dividend yield (in hundredths)			2.43%
Expected life (in years)			5 years 8 months 12 days
Volatility (in hundredths)			21.20%
Grant price			$ 82.09
Fair value on date of grant			15.41
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Grant price			82.09
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant			15.41
Shares Granted to Directors [Abstract]
Fair value on date of grant			15.41
Maximum [Member] \| Performance Shares [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Fair value on date of grant		91.20	82.09
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant		91.20	82.09
Shares Granted to Directors [Abstract]
Fair value on date of grant		$ 91.20	82.09
Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Fair value on date of grant			82.09
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Fair value on date of grant			82.09
Shares Granted to Directors [Abstract]
Fair value on date of grant			$ 82.09
Discontinued Operations [Member]
Stock-based compensation expense [Abstract]
Pre-tax compensation expense			$ 744