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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic and diluted weighted average shares outstanding and earnings per share were as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions, except per share data)
 
2017
 
2016
 
2017
 
2016
Earnings per share - basic
 
 
 
 
 
 
 
 
Earnings available to common stockholders
 
$
64.9

 
$
17.3

 
$
127.3

 
$
29.9

Weighted average basic shares outstanding
 
181.9

 
182.5

 
182.3

 
182.4

Earnings per share - basic
 
$
0.36

 
$
0.09

 
$
0.70

 
$
0.16

 
 
 
 
 
 
 
 
 
Earnings per share - diluted
 
 
 
 
 
 
 
 
Earnings available to common stockholders
 
$
64.9

 
$
17.3

 
$
127.3

 
$
29.9

 
 
 
 
 
 
 
 
 
Weighted average basic shares outstanding
 
181.9

 
182.5

 
182.3

 
182.4

Dilutive impact of stock based awards
 
7.4

 
1.9

 
7.5

 
1.8

Weighted average dilutive shares outstanding
 
189.3

 
184.4

 
189.8

 
184.2

Earnings per share - diluted
 
$
0.34

 
$
0.09

 
$
0.67

 
$
0.16