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Stock Incentive Compensation and Employee Benefit Plans (Equity Compensation Other than Options) (Details) - $ / shares	12 Months Ended
	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.

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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.

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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).

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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).

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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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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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