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Earnings Per Share (Tables)
 9 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Numerator and denominator used to compute basic and diluted earnings per share
The following table sets forth the numerators and denominators used in the computation of basic and diluted earnings per share.
 
 
Three Months Ended 
 June 30,
 
Nine Months Ended 
 June 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(In millions)
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
289.0

 
$
249.8

 
$
725.1

 
$
602.6

Denominator:
 
 
 
 
 
 
 
 
Denominator for basic earnings per share — weighted average common shares
 
374.8

 
371.8

 
374.1

 
370.4

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Employee stock awards
 
4.6

 
4.1

 
4.4

 
4.0

Denominator for diluted earnings per share — adjusted weighted average common shares
 
379.4

 
375.9

 
378.5

 
374.4

 
 
 
 
 
 
 
 
 
Basic net income per common share
 
$
0.77

 
$
0.67

 
$
1.94

 
$
1.63

Net income per common share assuming dilution
 
$
0.76

 
$
0.66

 
$
1.92

 
$
1.61