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Common Equity (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
Nine Months Ended September 30,
(In millions except per share data)
2016
2015
2016
2015
Net income
$
183.6

$
111.2

$
280.3

$
241.9

Average Common Shares Outstanding
 
 
 
 
Basic average common shares outstanding
199.7

199.7

199.7

199.6

Effect of dilutive securities:
 
 
 
 
Contingently issuable shares (performance and restricted stock units)
0.2

—

0.1

—

Diluted average common shares outstanding
199.9

199.7

199.8

199.6

Basic Earnings Per Average Common Share
$
0.92

$
0.55

$
1.40

$
1.21

Diluted Earnings Per Average Common Share
$
0.92

$
0.55

$
1.40

$
1.21

Anti-dilutive shares excluded from earnings per share calculation
—

—

—

—