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Stock-Based Compensation and Other Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2012
782,281

 
$
19.10

Granted
431,346

 
31.04

Vested
(68,122
)
 
18.83

Canceled/forfeited
(21,960
)
 
14.93

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
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, 2012
1,043,825

 
$
10.50

 
2.33
 
$
15.1

Exercised
(513,254
)
 
10.04

 
 
 
 
Canceled/forfeited
(35,000
)
 
7.74

 
 
 
 
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

(a)
Amount represents the difference between the exercise price and the closing share price of the Company’s 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,
 
2014
 
2013
 
2012
Cash proceeds (in millions)
$
3.3

 
$
6.4

 
$
1.3

Common shares issued
136,918

 
454,523

 
90,614

Weighted average price per share
$
24.33

 
$
14.19

 
$
14.37

Weighted average per share grant date fair value
$
5.81

 
$
5.60

 
$
4.19
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,
 
2014
 
2013
 
2012
Non-cash stock-based compensation expense
$
15.9

 
$
12.9

 
$
4.4

Income Tax Effects:
 
 
 
 
 
Income tax benefit from non-cash stock-based compensation
$
8.7

 
$
9.7

 
$
2.5

Excess tax benefit from non-cash stock-based compensation (a)
$
3.7

 
$
4.3

 
$
0.8

(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.