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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
PRSU (benefit) expense
$
(0.9
)
 
$
1.2

 
$
0.2

 
$
2.0

Option expense
1.7

 
2.1

 
3.4

 
4.2

RSU/DSU expense
0.5

 
1.4

 
1.8

 
2.0

Total stock based compensation expense
$
1.3

 
$
4.7

 
$
5.4

 
$
8.2
Summary of PRSU activity and related information
A summary of the Company’s PRSU activity and related information for the six months ended June 30, 2014 is presented below:
(shares 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
)
 
39.56

 
 
Awards outstanding at June 30, 2014
0.3

 
$
51.86

 
$
16.7
Schedule of stock option activity
A summary of the Company’s stock option activity and related information for the six months ended June 30, 2014 is presented below:
(shares 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

 
50.55

 
 
 
 
Exercised
(0.1
)
 
19.56

 
 
 
 
Options outstanding at June 30, 2014
2.9

 
$
24.11

 
5.63

 
$
91.9

Options exercisable at June 30, 2014
2.3

 
$
19.17

 
4.87

 
$
94.7
Schedule of restricted stock units and deferred stock units
A summary of the Company’s RSU and DSU activity and related information for the six months ended June 30, 2014 is presented below:
(shares 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
)
 
44.00

 
 
Forfeited
0.0

 
46.62

 
 
Awards outstanding at June 30, 2014
0.1

 
$
49.41

 
$
5.0
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 six months ended June 30, 2014 is presented below:
($ in millions)
 
 
 
 
June 30, 2014
 
Weighted
 Average
 Remaining
 Vesting Period
(Years)
Unrecognized PRSU expense
$
12.3

 
2.02

Unrecognized stock option expense
4.1

 
2.57

Unrecognized RSU/DSU expense
0.7

 
0.83

Total unrecognized stock-based compensation expense
$
17.1

 
2.11