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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Schedule of Activity, Restricted Shares
Activity, restricted shares:
Restricted
Shares
 
Per Share
Weighted Average  
Grant Date
Fair Value
Non-vested restricted shares, as of December 31, 2013
1,123,545

 
$
23.78

Granted
972,754

 
26.88

Vested
(659,212
)
 
25.27

Canceled/forfeited
(22,442
)
 
17.38

Non-vested restricted shares, as of December 31, 2014
1,414,645

 
$
25.32

Granted
706,761

 
17.27

Vested
(446,874
)
 
21.24

Canceled/forfeited
(44,300
)
 
26.11

Non-vested restricted shares, as of December 31, 2015
1,630,232

 
$
22.94
Schedule of Activity, Stock Options
Activity, stock options:
Stock 
Options
 
Per Share Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic
 Value(a) 
(in millions)
Options outstanding and exercisable as of December 31, 2013
495,571

 
$
11.17

 
1.96
 
$
10.7

Exercised
(210,900
)
 
9.97

 
 
 
 
Canceled/forfeited
—

 

 
 
 
 
Options outstanding and exercisable as of December 31, 2014
284,671

 
$
12.06

 
1.29
 
$
3.0

Exercised
(81,971
)
 
9.60

 
 
 
 
Canceled/forfeited
—

 
 
 
 
 
 
Options outstanding and exercisable as of December 31, 2015
202,700

 
$
13.06

 
0.55
 
$
0.9

(a)
Amount represents the difference between the exercise price and the closing share price of the Company’s common stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.
Schedule of Activity, Employee Stock Purchase Plans
The following table provides details pertaining to the Company’s ESPPs for the periods indicated:
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Cash proceeds (in millions)
$
2.0

 
$
3.3

 
$
6.4

Common shares issued
134,389

 
136,918

 
454,523

Weighted average price per share
$
14.67

 
$
24.33

 
$
14.19

Weighted average per share grant date fair value
$
4.22

 
$
5.81

 
$
5.60
Schedule of Non-Cash Stock-Based Compensation Expense
Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions):
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Non-cash stock-based compensation expense
$
12.4

 
$
15.9

 
$
12.9

Income Tax Effects:
 
 
 
 
 
Income tax benefit from non-cash stock-based compensation
$
4.2

 
$
8.7

 
$
9.7

Excess tax benefit from non-cash stock-based compensation (a)
$
0.1

 
$
3.7

 
$
4.3

(a)
Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s consolidated statements of cash flows.