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Stock Incentive Compensation and Employee Benefit Plans (Equity Compensation Other than Options) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Settled Restricted Stock Unit (CSRSUs) |  |  |
Number of Shares |  |  |
Nonvested, beginning balance (in shares) | 63,744 | 146,917 | 262,330
Awards granted (in shares) | 0 | 0 | 0
Awards vested (in shares) | (44,734) | (80,012) | (108,344)
Awards forfeited (in shares) | (529) | (3,161) | (7,069)
Nonvested, ending balance (in shares) | 18,481 | 63,744 | 146,917
Performance Shares |  |  |
Number of Shares |  |  |
Nonvested, beginning balance (in shares) | 144,847 | 152,451 | 167,673
Awards granted (in shares) | 65,840 | 58,050 | 83,475
Awards vested (in shares) | (48,997) | (21,730) | (16,456)
Awards forfeited (in shares) | (9,976) | (43,924) | (82,241)
Nonvested, ending balance (in shares) | 151,714 | 144,847 | 152,451
Weighted Average Grant Date Fair Value |  |  |
Nonvested, beginning balance (in usd per share) | $ 94.70 | $ 57.21 | $ 53.11
Awards granted (in usd per share) | 170.40 | 146.10 | 60.69
Awards vested (in usd per share) | 61.48 | 49.90 | 53.79
Awards forfeited (in usd per share) | 0 | 0 | 0
Nonvested, ending balance (in usd per share) | $ 140.96 | $ 94.70 | $ 57.21
Employee Restricted Stock Awards |  |  |
Number of Shares |  |  |
Nonvested, beginning balance (in shares) | 510,860 | 447,740 | 333,037
Awards granted (in shares) | 309,892 | 242,832 | 255,799
Awards vested (in shares) | (213,488) | (165,245) | (139,454)
Awards forfeited (in shares) | (14,517) | (14,467) | (1,642)
Nonvested, ending balance (in shares) | 592,747 | 510,860 | 447,740
Weighted Average Grant Date Fair Value |  |  |
Nonvested, beginning balance (in usd per share) | $ 139.91 | $ 130.37 | $ 120.93
Awards granted (in usd per share) | 145.03 | 146.92 | 132.70
Awards vested (in usd per share) | 138.35 | 124.71 | 112.70
Awards forfeited (in usd per share) | 140.11 | 136.16 | 134.38
Nonvested, ending balance (in usd per share) | $ 143.14 | $ 139.91 | $ 130.37
Non-Employee Director Restricted Stock Awards |  |  |
Number of Shares |  |  |
Nonvested, beginning balance (in shares) | 21,006 | 22,534 | 20,126
Awards granted (in shares) | 9,970 | 11,444 | 12,169
Awards vested (in shares) | (10,316) | (12,972) | (9,761)
Awards forfeited (in shares) | 0 | 0 | 0
Nonvested, ending balance (in shares) | 20,660 | 21,006 | 22,534
Weighted Average Grant Date Fair Value |  |  |
Nonvested, beginning balance (in usd per share) | $ 140.79 | $ 132.29 | $ 131.09
Awards granted (in usd per share) | 170.40 | 147.43 | 127.29
Awards vested (in usd per share) | 141.12 | 131.88 | 123.59
Awards forfeited (in usd per share) | 0 | 0 | 0
Nonvested, ending balance (in usd per share) | $ 155.03 | $ 140.79 | $ 132.29
Total Restricted Stock Awards |  |  |
Number of Shares |  |  |
Nonvested, beginning balance (in shares) | 531,866 | 470,274 | 353,163
Awards granted (in shares) | 319,862 | 254,276 | 267,968
Awards vested (in shares) | (223,804) | (178,217) | (149,215)
Awards forfeited (in shares) | (14,517) | (14,467) | (1,642)
Nonvested, ending balance (in shares) | 613,407 | 531,866 | 470,274
Weighted Average Grant Date Fair Value |  |  |
Nonvested, beginning balance (in usd per share) | $ 139.94 | $ 130.46 | $ 121.51
Awards granted (in usd per share) | 145.82 | 146.94 | 132.79
Awards vested (in usd per share) | 138.47 | 125.23 | 113.41
Awards forfeited (in usd per share) | 140.11 | 136.16 | 134.38
Nonvested, ending balance (in usd per share) | $ 143.54 | $ 139.94 | $ 130.46

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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