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Common Equity (Tables)
12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Schedule of stock-based compensation expense and related deferred tax benefit recognized in income
The following table summarizes our pre-tax stock-based compensation expense and the related tax benefit for the years ended December 31:
(in millions)
 
2016
 
2015
 
2014
Stock options
 
$
3.5

 
$
3.3

 
$
3.7

Restricted stock
 
5.8

 
7.0

 
2.8

Performance units
 
8.7

 
13.0

 
15.4

Stock-based compensation expense
 
$
18.0

 
$
23.3

 
$
21.9

Related tax benefit
 
$
7.2

 
$
9.3

 
$
8.8

Schedule of stock option activity

The following is a summary of our stock option activity during 2016:
Stock Options
 
Number of Options
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2016
 
5,984,664

 
$
33.47

 
 
 
 
Granted
 
794,764

 
$
52.15

 
 
 
 
Exercised
 
(1,644,353
)
 
$
25.30

 
 
 
 
Forfeited
 
(12,300
)
 
$
52.98

 
 
 
 
Outstanding as of December 31, 2016
 
5,122,775

 
$
38.95

 
6.0
 
$
100.9

Exercisable as of December 31, 2016
 
3,710,836

 
$
35.38

 
5.2
 
$
86.4


Schedule of restricted stock activity
The following restricted stock activity occurred during 2016:
Restricted Shares
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
Outstanding as of January 1, 2016
 
229,018

 
$
46.78

Granted
 
146,941

 
$
53.69

Released
 
(141,224
)
 
$
46.14

Forfeited
 
(14,689
)
 
$
54.39

Outstanding as of December 31, 2016
 
220,046

 
$
51.30

Schedule of shares repurchased
The following table identifies shares purchased during the year ended December 31:
 
 
2016
 
2015
 
2014
(in millions)
 
Shares
 
Cost
 
Shares
 
Cost
 
Shares
 
Cost
Under share repurchase programs
 

 
$

 

 
$

 
0.4

 
$
18.6

To fulfill exercised stock options and restricted stock awards
 
1.8

 
108.0

 
1.5

 
74.7

 
2.3

 
104.6

Total
 
1.8

 
$
108.0

 
1.5


$
74.7


$
2.7


$
123.2

Schedule of dividends declared
During the year ended December 31, 2016, our Board of Directors declared common stock dividends which are summarized below:
Date Declared
 
Date Payable
 
Per Share
 
Period
January 21, 2016
 
March 1, 2016
 
$0.4950
 
First quarter
April 21, 2016
 
June 1, 2016
 
$0.4950
 
Second quarter
July 21, 2016
 
September 1, 2016
 
$0.4950
 
Third quarter
October 20, 2016
 
December 1, 2016
 
$0.4950
 
Fourth quarter