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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2019
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)
 
2019
 
2018
 
2017
Net income to common shareholders
 
$
249.0

 
$
207.1

 
$
36.7

Basic weighted average shares outstanding
 
233.9

 
239.0

 
240.4

Diluted weighted average shares outstanding
 
235.8

 
242.9

 
246.1

Net income per common share:
 
 
 
 
 
 
Basic net income per share
 
$
1.06

 
$
0.87

 
$
0.15

Diluted net income per share
 
$
1.06

 
$
0.85

 
$
0.15