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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
Stock option and appreciation rights
$
7.8

 
$
8.6

 
$
9.2

Performance share units, stock-settled
4.1

 
6.7

 
6.0

Performance share units, cash-settled
0.1

 
0.1

 
0.7

Performance share units, dividend equivalents
0.1

 
0.2

 
0.2

Employee stock purchase plan
0.8

 
0.7

 
0.6

Deferred compensation plans
3.2

 
3.2

 
2.5

Total stock-based compensation expense
$
16.1

 
$
19.5

 
$
19.2
Schedule of Stock Options Activity
The following table summarizes changes in outstanding options:
(in millions, except per share data)
2017
 
2016
 
2015
Options outstanding, January 1
4.5

 
5.0

 
4.6

Granted
0.5

 
0.7

 
0.9

Exercised
(1.5
)
 
(1.1
)
 
(0.5
)
Forfeited
—

 
(0.1
)
 
—

Options outstanding, December 31
3.5

 
4.5

 
5.0

Options exercisable, December 31
1.9

 
2.7

 
2.9

Weighted Average Exercise Price
2017
 
2016
 
2015
Options outstanding, January 1
$
38.11

 
$
31.77

 
$
25.49

Granted
84.09

 
61.98

 
56.06

Exercised
26.15

 
22.50

 
21.85

Forfeited
60.92

 
45.91

 
—

Options outstanding, December 31
$
48.76

 
$
38.11

 
$
31.77

Options exercisable, December 31
$
35.44

 
$
27.17

 
$
22.75
Schedule of Stock Appreciation Rights Award Activity
The following table summarizes changes in outstanding SARs:
 
2017
 
2016
 
2015
SARs outstanding, January 1
116,087

 
232,930

 
297,714

Granted
2,792

 
3,368

 
12,356

Exercised
(67,511
)
 
(114,976
)
 
(77,140
)
Forfeited
—

 
(5,235
)
 
—

SARs outstanding, December 31
51,368

 
116,087

 
232,930

SARs exercisable, December 31
39,769

 
71,701

 
112,295

Weighted Average Exercise Price
2017
 
2016
 
2015
SARs outstanding, January 1
$
31.13

 
$
27.79

 
$
25.20

Granted
83.47

 
68.40

 
57.25

Exercised
27.65

 
24.95

 
22.52

Forfeited
—

 
42.28

 
—

SARs outstanding, December 31
$
38.55

 
$
31.13

 
$
27.79

SARs exercisable, December 31
$
30.77

 
$
26.65

 
$
24.60
Schedule of Nonvested Performance-based Share Activity
The following table summarizes changes in our outstanding stock-settled PSU awards:
 
2017
 
2016
 
2015
Non-vested stock-settled PSU awards, January 1
378,062

 
422,726

 
470,719

Granted at target level
92,045

 
115,035

 
147,908

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

 
132,444

Vested and converted
(116,684
)
 
(173,364
)
 
(318,337
)
Forfeited
(110
)
 
(5,674
)
 
(10,008
)
Non-vested stock-settled PSU awards, December 31
341,944

 
378,062

 
422,726

 
 
 
 
 
 
Weighted Average Grant Date Fair Value
2017
 
2016
 
2015
Non-vested stock-settled PSU awards, January 1
$
54.47

 
$
45.60

 
$
30.93

Granted at target level
84.01

 
60.47

 
55.49

Adjustments above/(below) target
42.85

 
38.71

 
22.97

Vested and converted
50.06

 
59.64

 
51.53

Forfeited
73.64

 
49.86

 
41.84

Non-vested stock-settled PSU awards, December 31
$
64.38

 
$
54.47

 
$
45.60
Schedule of Nonvested Performance-based Units Activity
The following table summarizes changes in our outstanding cash-settled PSU awards:
 
2017
 
2016
 
2015
Non-vested cash-settled PSU awards, January 1
2,451

 
29,196

 
55,509

Granted at target level
598

 
419

 
1,386

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

 
19,315

Vested and converted
(970
)
 
(29,032
)
 
(47,014
)
Forfeited
—

 
(990
)
 
—

Non-vested cash-settled PSU awards, December 31
1,972

 
2,451

 
29,196


Weighted Average Grant Date Fair Value
2017
 
2016
 
2015
Non-vested cash-settled PSU awards, January 1
$
25.28

 
$
32.07

 
$
26.15

Granted at target level
83.47

 
59.64

 
54.14

Adjustments above/(below) target
66.61

 
30.80

 
22.07

Vested and converted
86.93

 
59.64

 
51.53

Forfeited
—

 
50.55

 
—

Non-vested cash-settled PSU awards, December 31
$
92.25

 
$
25.28

 
$
32.07