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Common Equity (Tables)
 12 Months Ended
Dec. 31, 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:
(In millions)
2015
2014
2013
Net Income
$
271.3

$
395.8

$
387.6

Average Common Shares Outstanding
 
 
 
Basic average common shares outstanding
199.6

199.2

198.2

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

0.7

1.2

Diluted average common shares outstanding
199.6

199.9

199.4

Basic Earnings Per Average Common Share
$
1.36

$
1.99

$
1.96

Diluted Earnings Per Average Common Share
$
1.36

$
1.98

$
1.94