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Common Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic and diluted earnings per share for the Company were calculated as follows:
 
Three Months Ended March 31,
(In millions except per share data)
2017
2016
Net income
$
36.0

$
25.2

Average Common Shares Outstanding
 
 
Basic average common shares outstanding
199.7

199.7

Effect of dilutive securities:
 
 
Contingently issuable shares (performance and restricted stock units)
0.3

—

Diluted average common shares outstanding
200.0

199.7

Basic Earnings Per Average Common Share
$
0.18

$
0.13

Diluted Earnings Per Average Common Share
$
0.18

$
0.13

Anti-dilutive shares excluded from earnings per share calculation
—

—