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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 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:
 
Year Ended December 31,
(In millions, except per share data)
2017
2016
2015
Net income to common shareholders
$
36.7

$
38.8

$
91.6

Basic weighted average shares outstanding
240.4

238.1

233.8

Diluted weighted average shares outstanding
246.1

244.4

239.7

Net income per common share:
 
 
 
Basic net income per share
$
0.15

$
0.16

$
0.39

Diluted net income per share
$
0.15

$
0.16

$
0.38