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Earnings Per Common Share and Share Awards Summary of Share-based Award Transactions (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding | shares	0
$60.00 - $99.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	$ 60.00
SARs exercise price, upper limit	$ 99.99
SARs Outstanding - As of December 31, 2020 | shares	9
SARs Outstanding - Weighted Average Remaining Contractual Life	1 year 4 months 17 days
SARs Outstanding - Weighted Average Exercise Price	$ 78.52
SARs Exercisable - Number Exercisable | shares	9
SARs Exercisable - Weighted Average Exercise Price	$ 78.52
$100.00 - $149.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	100.00
SARs exercise price, upper limit	$ 149.99
SARs Outstanding - As of December 31, 2020 | shares	12
SARs Outstanding - Weighted Average Remaining Contractual Life	6 years 5 months 4 days
SARs Outstanding - Weighted Average Exercise Price	$ 134.41
SARs Exercisable - Number Exercisable | shares	3
SARs Exercisable - Weighted Average Exercise Price	$ 122.80
$150.00 - $199.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	150.00
SARs exercise price, upper limit	$ 199.99
SARs Outstanding - As of December 31, 2020 | shares	15
SARs Outstanding - Weighted Average Remaining Contractual Life	4 years 5 months 23 days
SARs Outstanding - Weighted Average Exercise Price	$ 179.50
SARs Exercisable - Number Exercisable | shares	15
SARs Exercisable - Weighted Average Exercise Price	$ 179.50
$60.00 - $199.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
SARs exercise price, lower limit	60.00
SARs exercise price, upper limit	$ 199.99
SARs Outstanding - As of December 31, 2020 | shares	36
SARs Outstanding - Weighted Average Remaining Contractual Life	4 years 4 months 17 days
SARs Outstanding - Weighted Average Exercise Price	$ 139.16
SARs Exercisable - Number Exercisable | shares	27
SARs Exercisable - Weighted Average Exercise Price	$ 139.31

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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