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Common Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table calculates basic and diluted earnings per share for the Company.
 
Three Months Ended March 31,
(In millions except per share data)
2019
2018
Net income
$
47.1

$
55.0

Average common shares outstanding:
 
 
Basic average common shares outstanding
199.9

199.7

Effect of dilutive securities:
 
 
Contingently issuable shares (performance and restricted stock units)
0.6

0.5

Diluted average common shares outstanding
200.5

200.2

Basic earnings per average common share
$
0.24

$
0.28

Diluted earnings per average common share
$
0.24

$
0.27

Anti-dilutive shares excluded from earnings per share calculation
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