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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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
 
2019
 
2018
 
2017
Stock options
 
$
20.2

 
$
23.5

 
$
19.5

RSUs
 
26.5

 
30.4

 
26.4

PSUs
 
17.9

 
23.0

 
23.0

Deferred compensation
 
3.1

 
3.4

 
3.1

Other
 
3.5

 
0.5

 
1.6

Pre-tax expense
 
71.2

 
80.8

 
73.6

Tax benefit
 
(17.3
)
 
(19.6
)
 
(28.2
)
After-tax expense
 
$
53.9

 
$
61.2

 
$
45.4
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] ions were used during the year ended December 31:
 
 
2019
 
2018
 
2017
Dividend yield
 
2.06
%
 
2.00
%
 
2.00
%
Volatility
 
21.46
%
 
21.64
%
 
22.46
%
Risk-free rate of return
 
2.46
%
 
2.48
%
 
1.80
%
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 2019, 2018 and 2017 are as follows:
 
 
Shares
subject
to option
 
Weighted-
average
exercise price
 
Aggregate
intrinsic
value (millions)
 
Weighted-
average
remaining life (years)
December 31, 2016
 
6,846,895

 
$
47.81

 
 
 
 
Granted
 
1,518,335

 
80.27

 
 
 
 
Exercised
 
(1,789,615
)
 
42.79

 
 
 
 
Cancelled
 
(220,733
)
 
61.91

 
 
 
 
December 31, 2017
 
6,354,882

 
56.49

 
 
 
 
Granted
 
1,541,025

 
89.71

 
 
 
 
Exercised
 
(1,515,955
)
 
45.44

 
 
 
 
Cancelled
 
(94,601
)
 
79.53

 
 
 
 
December 31, 2018
 
6,285,351

 
66.95

 
 
 
 
Granted
 
1,286,857

 
101.42

 
 
 
 
Exercised
 
(2,076,338
)
 
56.17

 
 
 
 
Cancelled
 
(76,624
)
 
92.38

 
 
 
 
Outstanding December 31, 2019
 
5,419,246

 
$
78.91

 
$
292.7

 
6.8
Exercisable December 31, 2019
 
2,689,923

 
$
64.22

 
$
184.8

 
5.4
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,
2019
 
Weighted-
average
remaining
life (years)
 
Weighted-
average
exercise
price
 
Number
outstanding at
December 31,
2019
 
Weighted-
average
remaining
life (years)
 
Weighted-
average
exercise
price
$
20.01

 
—
 
$
30.00

 
42,296

 
1.0
 
$
24.72

 
42,296

 
1.0
 
$
24.72

30.01

 
—
 
40.00

 
140,778

 
1.7
 
34.07

 
140,778

 
1.7
 
34.07

40.01

 
—
 
50.00

 
820,185

 
5.0
 
48.46

 
820,185

 
5.0
 
48.46

50.01

 
—
 
60.00

 
291,706

 
3.9
 
59.41

 
291,706

 
3.9
 
59.41

60.01

 
—
 
70.00

 
417,212

 
4.7
 
66.99

 
417,212

 
4.7
 
66.99

70.01

 
—
 
80.00

 
14,031

 
7.0
 
75.67

 
—

 
0.0
 
—

80.01

 
—
 
90.00

 
1,228,171

 
6.8
 
80.84

 
638,735

 
6.6
 
80.33

90.01

 
—
 
100.00

 
1,242,338

 
7.8
 
90.12

 
334,982

 
7.8
 
90.07

100.01

 
—
 
110.00

 
1,193,089

 
8.9
 
101.29

 
4,029

 
7.9
 
101.22

110.01

 
—
 
125.00

 
29,440

 
9.5
 
122.34

 
—

 
0.0
 
—

$
24.23

 
—
 
$
124.95

 
5,419,246

 
6.8
 
$
78.91

 
2,689,923

 
5.4
 
$
64.22
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
The following table summarizes RSU activity for the years 2019, 2018 and 2017:
 
 
RSUs
 
Weighted-
average grant
date fair value
Outstanding and unvested at December 31, 2016
 
835,749

 
$
56.95

Granted
 
372,443

 
81.09

Vested
 
(370,397
)
 
58.56

Cancelled
 
(34,096
)
 
63.79

Outstanding and unvested at December 31, 2017
 
803,699

 
$
67.09

Granted
 
327,411

 
90.07

Vested
 
(389,285
)
 
64.88

Cancelled
 
(20,186
)
 
77.95

Outstanding and unvested at December 31, 2018
 
721,639

 
$
78.40

Granted
 
268,465

 
102.98

Vested
 
(364,817
)
 
70.26

Cancelled
 
(20,947
)
 
89.64

Outstanding and unvested at December 31, 2019
 
604,340

 
$
93.56
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 2019, 2018 and 2017:
 
 
PSUs
 
Weighted-average grant date fair value
Outstanding and unvested at December 31, 2016
 
1,423,796

 
$
65.34

Granted
 
419,404

 
93.68

Vested
 
(353,834
)
 
65.35

Forfeited
 
(124,830
)
 
73.40

Outstanding and unvested at December 31, 2017
 
1,364,536

 
$
73.31

Granted
 
363,342

 
106.31

Vested
 
(309,306
)
 
76.00

Forfeited
 
(172,408
)
 
90.89

Outstanding and unvested at December 31, 2018
 
1,246,164

 
$
79.83

Granted
 
312,362

 
111.12

Vested
 
(539,402
)
 
53.76

Forfeited
 
(34,194
)
 
106.14

Outstanding and unvested at December 31, 2019
 
984,930

 
$
103.12
Share Based Compensation Stock Option And Restricted Stock Units Granted [Text Block]
Grants issued during the year ended December 31 were as follows:
 
2019
 
2018
 
2017
 
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
1,286,857

 
$
17.17

 
1,541,025

 
$
15.51

 
1,518,335

 
$
13.46

RSUs
268,465

 
$
102.98

 
327,411

 
$
90.07

 
372,443

 
$
81.09

Performance shares (1)
312,362

 
$
111.12

 
363,342

 
$
106.31

 
419,404

 
$
93.68

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