Share-Based Compensation Level 4 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected holding period	4 years 6 months	4 years
Total pretax employee share-based compensation expense included in net income	$ 15,423,000	$ 14,709,000	$ 14,168,000
Income tax benefit related to share-based compensation included in net income	$ 3,822,000	$ 3,877,000	$ 3,537,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	4,906,195
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	3 years 7 months 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 45.44
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	3,989,812
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 41.68
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,300,000
Stock Option Plan Exercise Range 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	55,320
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	1 month 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 22.28
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	55,320
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 22.28
Stock Option Plan Exercise Range 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	894,450
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	1 year 1 month 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 29.25
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	894,450
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 29.25
Stock Option Plan Exercise Range 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	1,519,695
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	2 years 7 months 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 39.65
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	1,519,695
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 39.65
Stock Option Plan Exercise Range 4 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	1,506,810
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 50.31
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	1,308,944
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 50.42
Stock Option Plan Exercise Range 5 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	558,220
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	6 years 1 month 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 59.76
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	211,403
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 59.76
Stock Option Plan Exercise Range 6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	371,700
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	7 years 1 month 6 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 70.34
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	0
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.60%	1.50%	1.80%
Risk-free interest rate	4.00%	1.80%	0.40%
Expected holding period			4 years
Total pretax employee share-based compensation expense included in net income	$ 5,929,000	$ 5,738,000	$ 5,514,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period	5,461,105
Options outstanding at beginning of period, weighted average exercise price	$ 40.47
Granted	371,700
Granted, Weighted Average Exercise Price	$ 70.34
Exercised	(926,610)
Exercised, Weighted Average Exercise Price	$ 26.10
Options outstanding at end of period	4,906,195	5,461,105
Options outstanding at end of period, weighted average exercise price	$ 45.44	$ 40.47
Options exercisable at December 31, 2011	4,906,195	5,461,105
Options exercisable at December 31, 2011, Weighted Average Exercise Price	$ 45.44	$ 40.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	3,989,812
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 41.68
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Expected volatility	25.40%	23.90%	23.50%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 6,800,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pretax employee share-based compensation expense included in net income	$ 6,128,000	$ 5,739,000	$ 5,647,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares at beginning of period	212,115
Nonvested restricted shares at beginning of period, weighted average grant date fair value	$ 54.66
Granted	89,484
Granted, Weighted Average Grant Date Fair Value	$ 70.34	$ 59.76	$ 49.59
Vested	(114,826)
Vested, Weighted Average Grant Date Fair Value	$ 53.38
Nonvested restricted shares at end of period	186,773	212,115
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 62.95	$ 54.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 6,130,000	$ 5,639,000	$ 5,496,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 1,715,000	2,552,000	3,513,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,000,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pretax employee share-based compensation expense included in net income	$ 3,366,000	$ 3,232,000	$ 3,007,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares at beginning of period	118,936
Nonvested restricted shares at beginning of period, weighted average grant date fair value	$ 54.31
Granted	52,162
Granted, Weighted Average Grant Date Fair Value	$ 70.34	$ 59.76	$ 49.59
Vested	(61,390)
Vested, Weighted Average Grant Date Fair Value	$ 52.47
Nonvested restricted shares at end of period	109,708	118,936
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 62.96	$ 54.31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 3,221,000	$ 3,143,000	$ 2,883,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	1,000,000	1,447,000	1,911,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 4,000,000
Performance Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.53%
Total pretax employee share-based compensation expense included in net income	$ 11,800,000	$ 14,600,000	$ 19,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted	88,084	99,923	111,449
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares at beginning of period, weighted average grant date fair value	$ 62.30
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 68.45	$ 62.30
Expected volatility	26.20%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 7 months 6 days