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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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)
2016
2015
2014
Stock option and appreciation rights
$
8.6

$
9.2

$
7.6

Performance-vesting shares
6.7

6.0

6.5

Performance-vesting units
0.1

0.7

1.9

Performance-vesting shares/units dividend equivalents
0.2

0.2

0.4

Employee stock purchase plan
0.7

0.6

0.5

Deferred compensation plans
3.2

2.5

1.7

Total stock-based compensation expense
$
19.5

$
19.2

$
18.6
Schedule of Stock Options Activity
The following table summarizes changes in outstanding options:
(in millions, except per share data)
2016

2015

2014

Options outstanding, January 1
5.0

4.6

4.8

Granted
0.7

0.9

0.7

Exercised
(1.1
)
(0.5
)
(0.7
)
Forfeited
(0.1
)
—

(0.2
)
Options outstanding, December 31
4.5

5.0

4.6

Options exercisable, December 31
2.7

2.9

2.6

Weighted Average Exercise Price
2016

2015

2014

Options outstanding, January 1
$
31.77

$
25.49

$
21.99

Granted
61.98

56.06

47.59

Exercised
22.50

21.85

20.17

Forfeited
45.91

—

31.42

Options outstanding, December 31
$
38.11

$
31.77

$
25.49

Options exercisable, December 31
$
27.17

$
22.75

$
20.67
Schedule of Stock Appreciation Rights Award Activity
The following table summarizes changes in outstanding SARs:
 
2016

2015

2014

SARs outstanding, January 1
232,930

297,714

375,104

Granted
3,368

12,356

7,733

Exercised
(114,976
)
(77,140
)
(85,123
)
Forfeited
(5,235
)
—

—

SARs outstanding, December 31
116,087

232,930

297,714

SARs exercisable, December 31
71,701

112,295

88,751

Weighted Average Exercise Price
2016

2015

2014

SARs outstanding, January 1
$
27.79

$
25.20

$
24.03

Granted
68.40

57.25

47.74

Exercised
24.95

22.52

22.09

Forfeited
42.28

—

—

SARs outstanding, December 31
$
31.13

$
27.79

$
25.20

SARs exercisable, December 31
$
26.65

$
24.60

$
23.15
Schedule of Nonvested Performance-based Share Activity
The following table summarizes changes in our outstanding PVS awards:
 
2016

2015

2014

Non-vested PVS awards, January 1
422,726

470,719

578,358

Granted at target level
115,035

147,908

133,823

Adjustments above/(below) target
19,339

132,444

53,438

Vested and converted
(173,364
)
(318,337
)
(250,205
)
Forfeited
(5,674
)
(10,008
)
(44,695
)
Non-vested PVS awards, December 31
378,062

422,726

470,719

 
 
 
 
Weighted Average Grant Date Fair Value
2016

2015

2014

Non-vested PVS awards, January 1
$
45.60

$
30.93

$
23.79

Granted at target level
60.47

55.49

47.21

Adjustments above/(below) target
38.71

22.97

22.86

Vested and converted
59.64

51.53

48.69

Forfeited
49.86

41.84

30.76

Non-vested PVS awards, December 31
$
54.47

$
45.60

$
30.93
Schedule of Nonvested Performance-based Units Activity
The following table summarizes changes in our outstanding PVU awards:
 
2016

2015

2014

Non-vested PVU awards, January 1
29,196

55,509

79,456

Granted at target level
419

1,386

1,584

Adjustments above/(below) target
2,858

19,315

6,907

Vested and converted
(29,032
)
(47,014
)
(32,438
)
Forfeited
(990
)
—

—

Non-vested PVU awards, December 31
2,451

29,196

55,509


Weighted Average Grant Date Fair Value
2016

2015

2014

Non-vested PVU awards, January 1
$
32.07

$
26.15

$
23.86

Granted at target level
59.64

54.14

47.34

Adjustments above/(below) target
30.80

22.07

22.72

Vested and converted
59.64

51.53

47.34

Forfeited
50.55

—

—

Non-vested PVU awards, December 31
$
25.28

$
32.07

$
26.15