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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic and diluted weighted average shares outstanding and earnings per share were as follows:
(in millions, except per share data)
 
Three Months Ended June 30, 2016
 
Three Months Ended June 30, 2015
 
Six Months Ended June 30, 2016
 
Six Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
Earnings per share - basic
 
 
 
 
 
 
 
 
Earnings available to common shareholders
 
$
17.3

 
$
(2.6
)
 
$
29.9

 
$
(9.2
)
Weighted average basic shares outstanding
 
182.5

 
148.5

 
182.4

 
148.2

Earnings per share - basic
 
$
0.09

 
$
(0.02
)
 
$
0.16

 
$
(0.06
)
 
 
 
 
 
 
 
 
 
Earnings per share - diluted
 
 
 
 
 
 
 
 
Earnings available to common shareholders
 
$
17.3

 
$
(2.6
)
 
$
29.9

 
$
(9.2
)
 
 
 
 
 
 
 
 
 
Weighted average basic shares outstanding
 
182.5

 
148.5

 
182.4

 
148.2

Dilutive impact of stock based awards
 
1.9

 
—

 
1.8

 
—

Weighted average dilutive shares outstanding
 
184.4

 
148.5

 
184.2

 
148.2

Earnings per share - diluted
 
$
0.09

 
$
(0.02
)
 
$
0.16

 
$
(0.06
)