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Earnings (Loss) Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
A reconciliation of our basic and diluted net income per common share is as follows:
 
Three Months Ended June 30,
Six Months Ended June 30,
(In millions, except per share data)
2017
2016(1)
2017
2016(1)
Net income (loss) to common shareholders
$
(20.8
)
$
50.7

$
43.3

$
82.6

Basic weighted average shares outstanding
240.9

237.7

240.4

237.4

Diluted weighted average shares outstanding
240.9

244.3

246.5

243.8

Net income (loss) per common share:
 
 


Basic net income (loss) per share
$
(0.09
)
$
0.21

$
0.18

$
0.35

Diluted net income (loss) per share
$
(0.09
)
$
0.21

$
0.18

$
0.34

(1) Net income per common share for the three and six months ended June 30, 2016 is inclusive of effects of the adoption of ASU 2016-09, discussed further at Note 1, which increased diluted weighted average shares outstanding by 1.9 million shares and 1.8 million shares, respectively.