Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement, Disclosure [Abstract]

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

The following table summarizes the expenses recognized:

In millions	2023		2022		2021
Stock options	$	16.1	$	14.1	$	16.7
RSUs	23.5		19.7		21.9
PSUs	23.2		20.7		26.1
Deferred compensation	4.3		1.2		3.0
Pre-tax expense	67.1		55.7		67.7
Tax benefit	(16.3)		(13.5)		(16.4)
After-tax expense	$	50.8	$	42.2	$	51.3
Amounts recorded in continuing operations	$	50.8	$	42.6	$	51.3
Amounts recorded in discontinued operations	—		(0.4)		—
Total	$	50.8	$	42.2	$	51.3

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following assumptions were used during the year ended December 31:

	2023		2022		2021
Dividend yield	1.50	%	1.60	%	1.60	%
Volatility	29.37	%	28.23	%	27.90	%
Risk-free rate of return	3.62	%	1.56	%	0.45	%
Expected life in years	4.8		4.8		4.8

Share-based Payment Arrangement, Option, Activity [Table Text Block]

Changes in options outstanding under the plans for the years 2023, 2022 and 2021 were as follows:

	Shares subject to option	Weighted- average exercise price		Aggregate intrinsic value (millions)		Weighted- average remaining life (years)
December 31, 2020	5,719,358	$	70.53
Granted	589,417	150.34
Exercised	(1,872,069)	64.74
Cancelled	(25,706)	115.33
December 31, 2021	4,411,000	$	83.39
Granted	430,496	167.93
Exercised	(633,962)	66.06
Cancelled	(57,050)	137.38
December 31, 2022	4,150,484	$	94.06
Granted	425,444	182.27
Exercised	(1,382,846)	80.67
Cancelled	(21,365)	168.18
Outstanding December 31, 2023	3,171,717	$	111.23	$	420.8	5.4
Exercisable December 31, 2023	2,284,656	$	88.17	$	355.8	4.3

Share-based Payment Arrangement, Activity [Table Text Block]

The following table summarizes information concerning currently outstanding and exercisable options:

					Options outstanding				Options exercisable
Range of exercise price					Number outstanding at December 31, 2023	Weighted- average remaining life (years)	Weighted- average exercise price		Number exercisable at December 31, 2023	Weighted- average remaining life (years)	Weighted- average exercise price
$	25.01	—	$	50.00	213,462	1.8	$	40.10	213,462	1.8	$	40.10
50.01		—	75.00		757,205	3.1	66.35		757,205	3.1	66.35
75.01		—	100.00		506,855	4.1	78.99		506,855	4.1	78.99
100.01		—	125.00		464,452	5.7	105.28		464,452	5.7	105.28
125.01		—	150.00		406,450	6.4	148.62		213,678	6.8	148.95
150.01		—	175.00		415,977	7.9	167.58		113,426	7.8	167.16
175.01		—	200.00		373,227	8.9	181.30		15,578	7.5	186.83
200.01		—	250.00		34,089	9.8	213.59		—	—	—
$	46.64	—	$	231.35	3,171,717	5.4	$	111.23	2,284,656	4.3	$	88.17

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

The following table summarizes RSU activity for the years 2023, 2022 and 2021:

	RSUs	Weighted- average grant date fair value
Outstanding and unvested at December 31, 2020	489,522	$	87.75
Granted	153,806	154.33
Vested	(266,041)	82.18
Cancelled	(6,257)	115.11
Outstanding and unvested at December 31, 2021	371,030	$	118.88
Granted	139,730	165.07
Vested	(202,172)	107.29
Cancelled	(13,935)	136.89
Outstanding and unvested at December 31, 2022	294,653	$	147.88
Granted	214,425	184.35
Vested	(154,134)	134.87
Cancelled	(13,153)	173.28
Outstanding and unvested at December 31, 2023	341,791	$	175.65

Schedule of Share-based Compensation, Performance Shares [Table Text Block]

The following table summarizes PSU activity for the maximum number of shares that may be issued for the years 2023, 2022 and 2021:

	PSUs	Weighted-average grant date fair value
Outstanding and unvested at December 31, 2020	1,018,472	$	99.53
Granted	284,300	181.84
Vested	(419,088)	82.93
Forfeited	(81,728)	160.86
Outstanding and unvested at December 31, 2021	801,956	$	131.14
Granted	195,930	170.31
Vested	(346,540)	89.70
Forfeited	(42,320)	164.21
Outstanding and unvested at December 31, 2022	609,026	$	165.02
Granted	208,046	207.23
Vested	(237,586)	147.33
Forfeited	(20,526)	186.32
Outstanding and unvested at December 31, 2023	558,960	$	187.47

Share Based Compensation Stock Option And Restricted Stock Units Granted [Text Block]

Grants issued during the years ended December 31 were as follows:

	2023			2022			2021
	Number Granted	Weighted-average fair value per award		Number Granted	Weighted-average fair value per award		Number Granted	Weighted-average fair value per award
Stock options	425,444	$	47.53	430,496	$	35.96	589,417	$	29.62
RSUs	214,425	$	184.35	139,730	$	165.07	153,806	$	154.33
Performance shares (1)	208,046	$	207.23	195,930	$	170.31	284,300	$	181.84

(1) The number of performance shares represents the maximum award level.