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Earnings (Loss) Per Common Share (Tables)
 9 Months Ended
Sep. 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 September 30,
Nine Months Ended September 30,
(In millions, except per share data)
2017
2016(1)
2017
2016(1)
Net income (loss) to common shareholders
$
54.9

$
(6.6
)
$
98.2

$
76.0

Basic weighted average shares outstanding
240.7

238.5

240.5

237.8

Diluted weighted average shares outstanding
245.8

238.5

246.2

244.2

Net income (loss) per common share:
 
 


Basic net income (loss) per share
$
0.23

$
(0.03
)
$
0.41

$
0.32

Diluted net income (loss) per share
$
0.22

$
(0.03
)
$
0.40

$
0.31

(1) Net income per common share for the nine months ended September 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 1.8 million shares. Based on the fact that diluted weighted average shares outstanding are equal to basic weighted average shares outstanding in periods of loss, there was no impact of this adoption on diluted weighted average shares outstanding during the three months ended September 30, 2016.