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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Allocation of Share-based Compensation Costs by Plan
The following table summarizes our stock-based compensation expense recorded within selling, general and administrative expenses for the years ended December 31:
($ in millions)
2018
 
2017
 
2016
Stock option and appreciation rights
$
8.6

 
$
7.8

 
$
8.6

Performance share units, stock-settled
2.5

 
4.1

 
6.7

Performance share units, cash-settled
—

 
0.1

 
0.1

Performance share units, dividend equivalents
0.1

 
0.1

 
0.2

Employee stock purchase plan
0.9

 
0.8

 
0.7

Deferred compensation plans
3.0

 
3.2

 
3.2

Total stock-based compensation expense
$
15.1

 
$
16.1

 
$
19.5
Schedule of Stock Options Activity
The following table summarizes changes in outstanding options:
(in millions, except per share data)
2018
 
2017
 
2016
Options outstanding, January 1
3.5

 
4.5

 
5.0

Granted
0.5

 
0.5

 
0.7

Exercised
(1.0
)
 
(1.5
)
 
(1.1
)
Forfeited
—

 
—

 
(0.1
)
Options outstanding, December 31
3.0

 
3.5

 
4.5

Options exercisable, December 31
1.7

 
1.9

 
2.7

Weighted Average Exercise Price
2018
 
2017
 
2016
Options outstanding, January 1
$
48.76

 
$
38.11

 
$
31.77

Granted
90.36

 
84.09

 
61.98

Exercised
35.95

 
26.15

 
22.50

Forfeited
75.32

 
60.92

 
45.91

Options outstanding, December 31
$
58.93

 
$
48.76

 
$
38.11

Options exercisable, December 31
$
45.32

 
$
35.44

 
$
27.17
Schedule of Stock Appreciation Rights Award Activity
The following table summarizes changes in outstanding SARs:
 
2018
 
2017
 
2016
SARs outstanding, January 1
51,368

 
116,087

 
232,930

Granted
3,480

 
2,792

 
3,368

Exercised
(14,629
)
 
(67,511
)
 
(114,976
)
Forfeited
(400
)
 
—

 
(5,235
)
SARs outstanding, December 31
39,819

 
51,368

 
116,087

SARs exercisable, December 31
30,285

 
39,769

 
71,701

Weighted Average Exercise Price
2018
 
2017
 
2016
SARs outstanding, January 1
$
38.55

 
$
31.13

 
$
27.79

Granted
89.64

 
83.47

 
68.40

Exercised
28.45

 
27.65

 
24.95

Forfeited
63.43

 
—

 
42.28

SARs outstanding, December 31
$
46.48

 
$
38.55

 
$
31.13

SARs exercisable, December 31
$
36.91

 
$
30.77

 
$
26.65
Schedule of Nonvested Performance-based Share Activity
The following table summarizes changes in our outstanding stock-settled PSU awards:
 
2018
 
2017
 
2016
Non-vested stock-settled PSU awards, January 1
341,944

 
378,062

 
422,726

Granted at target level
102,307

 
92,045

 
115,035

Adjustments above/(below) target
(2,284
)
 
(11,369
)
 
19,339

Vested and converted
(121,984
)
 
(116,684
)
 
(173,364
)
Forfeited
(23,946
)
 
(110
)
 
(5,674
)
Non-vested stock-settled PSU awards, December 31
296,037

 
341,944

 
378,062

 
 
 
 
 
 
Weighted Average Grant Date Fair Value
2018
 
2017
 
2016
Non-vested stock-settled PSU awards, January 1
$
64.38

 
$
54.47

 
$
45.60

Granted at target level
90.45

 
84.01

 
60.47

Adjustments above/(below) target
33.86

 
42.85

 
38.71

Vested and converted
93.00

 
50.06

 
59.64

Forfeited
68.65

 
73.64

 
49.86

Non-vested stock-settled PSU awards, December 31
$
76.84

 
$
64.38

 
$
54.47
Schedule of Nonvested Performance-based Units Activity
The following table summarizes changes in our outstanding cash-settled PSU awards:
 
2018
 
2017
 
2016
Non-vested cash-settled PSU awards, January 1
1,972

 
2,451

 
29,196

Granted at target level
560

 
598

 
419

Adjustments above/(below) target
(30
)
 
(107
)
 
2,858

Vested and converted
(910
)
 
(970
)
 
(29,032
)
Forfeited
—

 
—

 
(990
)
Non-vested cash-settled PSU awards, December 31
1,592

 
1,972

 
2,451


Weighted Average Grant Date Fair Value
2018
 
2017
 
2016
Non-vested cash-settled PSU awards, January 1
$
92.25

 
$
25.28

 
$
32.07

Granted at target level
89.64

 
83.47

 
59.64

Adjustments above/(below) target
41.53

 
66.61

 
30.80

Vested and converted
93.00

 
86.93

 
59.64

Forfeited
—

 
—

 
50.55

Non-vested cash-settled PSU awards, December 31
$
79.48

 
$
92.25

 
$
25.28