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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of activity related to options
The following table summarizes the activity related to options granted and exercised:
 
Year Ended December 31,
 
2016

2015

2014
Options granted
—

 
—

 
—

Weighted average grant date fair value
$
—

 
$
—

 
$
—

Options exercised
(428,938
)
 
(454,602
)
 
(479,831
)
Total intrinsic value of options exercised
$
10.8

 
$
12.0

 
$
10.3

Proceeds from option exercises
$
10.3

 
$
10.1

 
$
10.0



The activity related to the Company’s stock options is as follows:
 
Year Ended December 31, 2016
 
Options

Weighted
Average
Exercise Price

Weighted
Average
Contractual
Term

Aggregate
Intrinsic
Value
Outstanding at beginning of year
1,968,607

 
$
16.86

 

 

Exercised
(428,938
)
 
(15.24
)
 

 

Forfeited
(13,926
)
 
10.31

 

 

Outstanding at end of year
1,525,743

 
17.36

 
3.3 years
 
$
55.5

Exercisable at end of year
1,525,743

 
$
17.36

 
3.3 years
 
$
55.5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of compensation expense by type of award
The following table shows the total stock-related compensation expense relating to the stock options, RSUs, LTIPs and cash equivalent awards.
 
Year Ended December 31,
 
2016

2015

2014
Stock options
$
—

 
$
0.3

 
$
1.9

RSUs and performance-based equity awards
16.4

 
15.0

 
12.3

Cash-equivalent stock awards
21.9

 
34.4

 
37.8

Total
$
38.3


$
49.7


$
52.0
Rsus Other Than Performance Based Rsus  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of activity related to equity based awards granted and exercised
The activity related to the Company’s RSU awards is as follows:

Year Ended December 31, 2016
 
Number of Awards

Weighted
Average
Grant Date
Fair Value

Aggregate
Intrinsic
Value
Outstanding at beginning of year
819,309

 
$
37.33

 

RSUs granted
689,042

 
32.00

 

RSUs forfeited
(123,307
)
 
(34.80
)
 

RSUs fully vested
(251,115
)
 
(36.30
)
 

Outstanding at end of year
1,133,929

 
$
34.56

 
$
60.9
Performance Based Rsus  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of activity related to equity based awards granted and exercised
The activity related to the Company’s performance-based equity awards is as follows:
 
Year Ended December 31, 2016
 
Number of Awards
 
Weighted
Average
Grant Date
Fair Value
 
Aggregate
Intrinsic
Value
Outstanding at beginning of year
591,683

 
$
34.78

 
 
Performance-based equity awards granted
200,730

 
31.95

 
 
Additional awards granted due to achievement of performance criteria
24,979

 
29.24

 
 
Performance-based equity awards forfeited
(16,993
)
 
(36.71
)
 
 
Performance-based equity awards fully vested
(216,958
)
 
(29.24
)
 
 
Outstanding at end of year
583,441

 
$
35.57

 
$
31.3
Cash-equivalent stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of activity related to cash-equivalent equity awards
The activity related to the Company's cash-equivalent RSUs and performance-based equity awards is as follows:
 
RSU's
 
Performance-based Awards
Year Ended December 31, 2016
Number of Awards
 
Weighted Average Grant Date Fair Value
 
Number of Awards
 
Weighted Average Grant Date Fair Value
Outstanding at beginning of year
1,277,083

 
$
31.94

 
693,477

 
33.25

Granted
167,438

 
31.95

 
50,183

 
31.95

Additional awards granted due to achievement of performance criteria
—

 
—

 
37,434

 
29.24

Forfeited
(90,245
)
 
(33.66
)
 
(18,104
)
 
(35.27
)
Fully vested
(581,829
)
 
(29.14
)
 
(325,386
)
 
(29.24
)
Outstanding at end of year
772,447

 
$
33.86

 
437,604

 
$
35.65