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Earnings Per Share
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
 
Computation of Earnings Per Share 

 
First Quarter
 
2020

2019
 
(in millions, except per share amounts)
Basic Earnings Per Share (EPS):
 
 
 
Net income (loss) attributable to AGL
$
(55
)
 
$
54

Less: Distributed and undistributed income (loss) available to nonvested shareholders
—

 
—

Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic
$
(55
)
 
$
54

Basic shares
92.6

 
103.0

Basic EPS
$
(0.59
)
 
$
0.52

 
 
 
 
Diluted EPS:
 
 
 
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic
$
(55
)
 
$
54

Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries
—

 
—

Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted
$
(55
)
 
$
54

 
 
 
 
Basic shares
92.6

 
103.0

Dilutive securities:
 
 
 
Options and restricted stock awards
—

 
1.0

Diluted shares
92.6

 
104.0

Diluted EPS
$
(0.59
)
 
$
0.52

Potentially dilutive securities excluded from computation of EPS because of antidilutive effect
1.7

 
—