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Common Equity (Tables)
 3 Months Ended
Mar. 31, 2016
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)
2016
2015
Net Income
$
25.2

$
43.2

Average Common Shares Outstanding
 
 
Basic average common shares outstanding
199.7

199.5

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

—

Diluted average common shares outstanding
199.7

199.5

Basic Earnings Per Average Common Share
$
0.13

$
0.22

Diluted Earnings Per Average Common Share
$
0.13

$
0.22

Anti-dilutive shares excluded from earnings per share calculation
—

—