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Equity Incentive Programs (Tables)
6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
The following table is a summary of the stock option activity for the six months ended June 30, 2016:

 
Shares Under
Option
 
Weighted Average
Exercise
Price
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic Value
(millions)
Outstanding at December 31, 2015
3,290,336

 
$
21.37

 
3.6
 
$

Granted

 

 

 


Exercised
(130,424
)
 
13.96

 
 
 


Canceled/forfeited/expired
(21,485
)
 
26.54

 
 
 


Outstanding and exercisable at June 30, 2016
3,138,427

 
$
21.64

 
3.0
 
$
13.4



Summary of Stock Option Exercises and Vesting Activity
The following table is a summary of the stock option exercises and vesting activity for the three and six months ended June 30, 2016 and 2015:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Total intrinsic value of stock options exercised
$
0.8

 
$
0.4

 
$
0.8

 
$
1.3

Cash received from stock option exercises
1.7

 
0.9

 
1.7

 
2.2

Total grant date fair value of stock options vested

 

 
0.3

 
1.8

Summary of RS and RSU Award Activity
The following table is a summary of RS and RSU award activity for the six months ended June 30, 2016:

 
Restricted Stock
 
Restricted Stock Units
 
Shares
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Units
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
Weighted-
Average
Remaining
Contractual
Term (years)
Nonvested at December 31, 2015
1,549,624

 
$
22.56

 
1.3
 
97,746

 
$
16.58

 
1.7
Granted
1,311,592

 
9.38

 
 
 
167,500

 
9.30

 
 
Vested
(331,979
)
 
20.39

 
 
 
(14,554
)
 
20.51

 
 
Forfeited
(32,990
)
 
23.01

 
 
 
(13,722
)
 
18.19

 
 
Nonvested at June 30, 2016
2,496,247

 
$
15.92

 
1.9
 
236,970

 
$
11.10

 
2.3
Summary of DSU Award Activity
The following table is a summary of DSU award activity for the six months ended June 30, 2016:

 
Deferred Stock Units
 
Units
 
Weighted-Average Grant Date Fair Value Per Share
Outstanding at December 31, 2015
156,807

 
$
20.51

Granted
78,750

 
9.30

Dividend equivalents granted
8,174

 
16.58

Settled

 

Forfeited

 

Outstanding at June 30, 2016
243,731

 
$
16.76