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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock-based compensation expense
A summary of the Company’s stock-based compensation expense is presented below:
(in millions)
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
PRSU expense
$
1.6

 
$
1.6

 
$
1.8

 
$
3.6

Option expense
1.8

 
2.1

 
5.2

 
6.3

RSU/DSU expense
0.6

 
1.9

 
2.4

 
3.9

Total stock-based compensation expense
$
4.0

 
$
5.6

 
$
9.4

 
$
13.8
Summary of PRSU activity and related information
A summary of the Company’s PRSU activity and related information for the nine months ended September 30, 2014 is presented below:
(shares and aggregate intrinsic value in millions)
 
 
 
 
 
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
 
Aggregate
Intrinsic Value
Awards outstanding at December 31, 2013
0.3

 
$
39.04

 
 
Granted
0.3

 
51.86

 
 
Vested
0.0

 
37.05

 
 
Forfeited
(0.3
)
 
39.64

 
 
Awards outstanding at September 30, 2014
0.3

 
$
51.86

 
$
15.7
Schedule of stock option activity
A summary of the Company’s stock option activity and related information for the nine months ended September 30, 2014 is presented below:
(shares and aggregate intrinsic value in millions)

 
 
 
 
 
 
 
 
Number
of Shares
 
Weighted-
Average Grant
Date Fair Value
 
Weighted-
Average
 Remaining
Contractual
Term (Years)
 
Aggregate
 Intrinsic Value
Options outstanding December 31, 2013
2.8

 
$
21.73

 
 
 
 
Granted
0.2

 
51.91

 
 
 
 
Forfeited
0.0

 
50.67

 
 
 
 
Exercised
(0.2
)
 
20.18

 
 
 
 
Options outstanding at September 30, 2014
2.8

 
$
24.07

 
5.37

 
$
88.1

Options exercisable at September 30, 2014
2.3

 
$
19.18

 
4.61

 
$
86.1
Schedule of restricted stock units and deferred stock units
A summary of the Company’s RSU and DSU activity and related information for the nine months ended September 30, 2014 is presented below:
(shares and aggregate intrinsic value in millions)

 
 
 
 
 
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
 
Aggregate
Intrinsic Value
Awards outstanding at December 31, 2013
0.2

 
$
47.00

 
 
Granted
0.0

 
52.87

 
 
Vested
(0.1
)
 
44.18

 
 
Forfeited
0.0

 
46.62

 
 
Awards outstanding at September 30, 2014
0.1

 
$
49.68

 
$
5.3
Schedule of Unrecognized Compensation Expense
A summary of total unrecognized stock-based compensation expense based on current performance estimates related to the PRSUs, options, RSUs and DSUs granted during the nine months ended September 30, 2014 is presented below:
($ in millions)
 
 
 
 
September 30, 2014
 
Weighted
 Average
 Remaining
 Vesting Period
(Years)
Unrecognized PRSU expense
$
10.6

 
1.79

Unrecognized stock option expense
3.7

 
2.34

Unrecognized RSU/DSU expense
0.5

 
0.58

Total unrecognized stock-based compensation expense
$
14.8

 
1.89