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Common Equity (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
Six Months Ended June 30,
(In millions except per share data)
2019
2018
2019
2018
Net income
$
100.2

$
110.7

$
147.3

$
165.7

Average common shares outstanding:
 
 
 
 
Basic average common shares outstanding
200.2

199.7

200.1

199.7

Effect of dilutive securities:
 
 
 
 
Contingently issuable shares (performance and restricted stock units)
0.4

0.8

0.4

0.6

Diluted average common shares outstanding
200.6

200.5

200.5

200.3

Basic earnings per average common share
$
0.50

$
0.55

$
0.74

$
0.83

Diluted earnings per average common share
$
0.50

$
0.55

$
0.73

$
0.83

Anti-dilutive shares excluded from earnings per share calculation
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