Share-Based Compensation Level 4 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected holding period	5 years	4 years 9 months 18 days
Total pretax employee share-based compensation expense included in net income	$ 17,633,000	$ 18,783,000	$ 17,043,000
Income tax benefit related to share-based compensation included in net income	$ 4,459,000	$ 4,358,000	$ 4,224,000
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, Period for Recognition	1 year 9 months 18 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 6,600,000
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	3,267,063
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	3 years 9 months 18 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 57.99
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	2,589,716
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 53.75
Stock Option Plan Exercise Range 7 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	327,963
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	$ 78.57
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 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	467,588
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	1 year
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning Balance	$ 42.01
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	467,588
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 42.01
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	1,199,319
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	$ 50.27
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	1,199,319
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 50.27
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	527,703
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	4 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	527,703
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 59.76
Stock Option Plan Exercise Range 6 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding	744,490
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	5 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	$ 70.16
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable	395,106
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 70.21
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.70%	1.80%	1.60%
Risk-free interest rate	4.30%	4.30%	4.00%
Expected holding period			4 years 6 months
Total pretax employee share-based compensation expense included in net income	$ 6,076,000	$ 6,701,000	$ 5,929,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period	3,643,548
Options outstanding at beginning of period, weighted average exercise price	$ 53.00
Granted	327,963
Granted, Weighted Average Exercise Price	$ 78.57
Exercised	(704,448)
Exercised, Weighted Average Exercise Price	$ 41.74
Options outstanding at end of period	3,267,063	3,643,548
Options outstanding at end of period, weighted average exercise price	$ 57.99	$ 53.00
Options exercisable at December 31, 2011	3,267,063	3,643,548
Options exercisable at December 31, 2011, Weighted Average Exercise Price	$ 57.99	$ 53.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,589,716
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 53.75
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Expected volatility	25.40%	25.70%	25.40%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,200,000
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	$ 6,209,000	$ 6,743,000	$ 6,128,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares at beginning of period	174,989
Nonvested restricted shares at beginning of period, weighted average grant date fair value	$ 68.41
Granted	85,627
Granted, Weighted Average Grant Date Fair Value	$ 78.57	$ 69.98	$ 70.34
Vested	(86,841)
Vested, Weighted Average Grant Date Fair Value	$ 66.70
Nonvested restricted shares at end of period	173,775	174,989
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 74.27	$ 68.41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 5,792,000	$ 6,687,000	$ 6,130,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 1,006,000	2,155,000	1,715,000
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	$ 7,700,000
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	$ 3,637,000	$ 3,720,000	$ 3,366,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares at beginning of period	103,954
Nonvested restricted shares at beginning of period, weighted average grant date fair value	$ 68.42
Granted	54,344
Granted, Weighted Average Grant Date Fair Value	$ 78.57	$ 69.98	$ 70.34
Vested	(51,573)
Vested, Weighted Average Grant Date Fair Value	$ 66.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	3,940
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 74.28
Nonvested restricted shares at end of period	102,785	103,954
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 74.41	$ 68.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 3,441,000	$ 3,634,000	$ 3,221,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	596,000	1,188,000	1,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 4,500,000
Performance Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.48%
Total pretax employee share-based compensation expense included in net income	$ 6,400,000	$ 10,800,000	$ 11,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted	84,004	96,761	88,084
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	$ 72.23
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 77.96	$ 72.23
Expected volatility	22.20%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 4 months 24 days
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pretax employee share-based compensation expense included in net income	$ 1,710,000	$ 1,620,000	$ 1,620,000
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total pretax employee share-based compensation expense included in net income	$ 15,923,000	$ 17,163,000	$ 15,423,000