INCENTIVE PLANS (Tables)

12 Months Ended

Dec. 31, 2022

Aggregate Values for Distributed Restricted Share Awards

in millions	2022	2021	2020
Aggregate value of distributed
restricted shares	$          15.7	$            9.0	$          12.2

Weighted-Average Fair Value and Weighted-Average Assumptions Used in Estimating Fair Value of Grants

	2022	2021	2020
SOSARs
Fair value	$        60.57	$        52.19	$        40.91
Risk-free interest rate	2.02%	1.18%	1.50%
Dividend yield	0.77%	0.62%	0.71%
Volatility	26.68%	27.33%	25.74%
Expected term (years)	9.00	9.00	9.00

Aggregate Intrinsic Values of Options Exercised

in millions	2022	2021	2020
Aggregate intrinsic value of SOSARs exercised	$            1.9	$          24.9	$          22.3

Performance Shares [Member]

Summary of Activity For Nonvested Performance Share Units

	Target	Weighted-average
	Number	Grant Date
	of Shares	Fair Value
Performance Shares
Nonvested at January 1, 2022	220,988	$           148.93
Granted	116,825	185.31
Vested	(109,880)	133.95
Canceled/forfeited	(8,032)	163.95
Nonvested at December 31, 2022	219,901	$           160.48

Aggregate Value of Performance Shares

in millions	2022	2021	2020
Aggregate value of distributed
performance shares	$          33.4	$          19.6	$          38.8

Restricted Shares [Member]

Summary of Restricted Stock Units

		Weighted-average
	Number	Grant Date
	of Shares	Fair Value
Restricted Stock Units
Nonvested at January 1, 2022	205,280	$           135.26
Granted	76,036	184.49
Vested	(86,326)	117.27
Canceled/forfeited	(9,502)	162.76
Nonvested at December 31, 2022	185,488	$           162.40

SOSARs [Member]

Summary of Our SOSAR Activity

			Weighted-average
			Remaining	Aggregate
	Number	Weighted-average	Contractual	Intrinsic Value
	of Shares	Exercise Price	Life (Years)	(in millions)
SOSARs
Outstanding at January 1, 2022	624,144	$           105.43
Granted	69,015	185.29
Exercised	(18,790)	74.66
Forfeited or expired	0	0.00
Outstanding at December 31, 2022	674,369	$           114.46	4.74	$               41.0
Exercisable at December 31, 2022	536,100	$           100.29	3.79	$               39.6

Cash Consideration Received and Tax Benefit Realized from SOSAR Exercises and Compensation Cost Recorded

in millions	2022	2021	2020
SOSARs
Cash received from exercises	$            0.0	$            0.0	$            0.0
Tax benefit from exercises	0.4	6.3	5.7
Compensation cost	4.0	3.9	3.9