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Earnings Per Common Share and Share Awards Summary of Share-based Award Transactions (Details) shares in Thousands | 12 Months Ended
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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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