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Earnings Per Share (Tables)
 3 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Common Shares Outstanding and Anti-dilutive Common Shares
The following table sets forth the weighted average number of common shares outstanding used in determining basic and diluted earnings per common share and anti-dilutive shares:
Weighted Average Number of Common Shares Outstanding and
Anti-dilutive Common Shares
(in millions)
Quarter Ended 
 December 31,
2018
 
2017
Weighted average number of common shares outstanding, basic
403.1

 
402.5

        Dilutive effect of equity awards
0.4

 
0.1

Weighted average number of common shares outstanding, diluted
403.5

 
402.6

 
 
 
 
Anti-dilutive common shares
19.8

 
19.1