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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
2014
2013
Stock option and appreciation rights
$
9.2

$
7.6

$
7.7

Performance-vesting shares
6.0

6.5

6.5

Performance-vesting units
0.7

1.9

2.4

Performance-vesting shares/units dividend equivalents
0.2

0.4

0.4

Employee stock purchase plan
0.6

0.5

0.4

Deferred compensation plans
2.5

1.7

3.8

Total stock-based compensation expense
$
19.2

$
18.6

$
21.2
Schedule of Stock Options Activity
The following table summarizes changes in outstanding options:

(in millions, except per share data)
2015

2014

2013

Options outstanding, January 1
4.6

4.8

5.6

Granted
0.9

0.7

0.9

Exercised
(0.5
)
(0.7
)
(1.6
)
Forfeited
—

(0.2
)
(0.1
)
Options outstanding, December 31
5.0

4.6

4.8

Options exercisable, December 31
2.9

2.6

2.3

Weighted Average Exercise Price
2015

2014

2013

Options outstanding, January 1
$
25.49

$
21.99

$
19.83

Granted
56.06

47.59

29.71

Exercised
21.85

20.17

18.97

Forfeited
—

31.42

23.10

Options outstanding, December 31
$
31.77

$
25.49

$
21.99

Options exercisable, December 31
$
22.75

$
20.67

$
19.51
Schedule of Stock Appreciation Rights Award Activity
The following table summarizes changes in outstanding SARs:
 
2015

2014

2013

SARs outstanding, January 1
297,714

375,104

389,686

Granted
12,356

7,733

132,566

Exercised
(77,140
)
(85,123
)
(147,148
)
SARs outstanding, December 31
232,930

297,714

375,104

SARs exercisable, December 31
112,295

88,751

56,938

Weighted Average Exercise Price
2015

2014

2013

SARs outstanding, January 1
$
25.20

$
24.03

$
20.81

Granted
57.25

47.74

29.56

Exercised
22.52

22.09

20.47

SARs outstanding, December 31
$
27.79

$
25.20

$
24.03

SARs exercisable, December 31
$
24.60

$
23.15

$
20.95
Schedule of Nonvested Performance-based Share Activity
The following table summarizes changes in our outstanding PVS awards:
 
2015

2014

2013

Non-vested PVS awards, January 1
470,719

578,358

652,662

Granted at target level
147,908

133,823

175,498

Adjustments above/(below) target
132,444

53,438

38,330

Vested and converted
(318,337
)
(250,205
)
(273,044
)
Forfeited
(10,008
)
(44,695
)
(15,088
)
Non-vested PVS awards, December 31
422,726

470,719

578,358

 
 
 
 
Weighted Average Grant Date Fair Value
2015

2014

2013

Non-vested PVS awards, January 1
$
30.93

$
23.79

$
21.42

Granted at target level
55.49

47.21

29.67

Adjustments above/(below) target
22.97

22.86

23.83

Vested and converted
51.53

48.69

29.56

Forfeited
41.84

30.76

23.29

Non-vested PVS awards, December 31
$
45.60

$
30.93

$
23.79
Schedule of Nonvested Performance-based Units Activity
The following table summarizes changes in our outstanding PVU awards:
 
2015

2014

2013

Non-vested PVU awards, January 1
55,509

79,456

69,240

Granted at target level
1,386

1,584

25,538

Adjustments above/(below) target
19,315

6,907

3,000

Vested and converted
(47,014
)
(32,438
)
(18,322
)
Non-vested PVU awards, December 31
29,196

55,509

79,456


Weighted Average Grant Date Fair Value
2015

2014

2013

Non-vested PVU awards, January 1
$
26.15

$
23.86

$
20.98

Granted at target level
54.14

47.34

29.56

Adjustments above/(below) target
22.07

22.72

25.30

Vested and converted
51.53

47.34

29.56

Non-vested PVU awards, December 31
$
32.07

$
26.15

$
23.86