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Common Equity (Tables)
 6 Months Ended
Jun. 30, 2015
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 June 30,
Six Months Ended June 30,
(In millions except per share data)
2015
2014
2015
2014
Net Income
$
87.5

$
100.8

$
130.7

$
150.1

Average Common Shares Outstanding
 
 
 
 
Basic average common shares outstanding
199.6

199.2

199.6

199.0

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

0.8

—

0.8

Diluted average common shares outstanding
199.6

200.0

199.6

199.8

Basic Earnings Per Average Common Share
$
0.44

$
0.51

$
0.66

$
0.75

Diluted Earnings Per Average Common Share
$
0.44

$
0.50

$
0.66

$
0.75

Anti-dilutive shares excluded from earnings per share calculation
—

—

—

—