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Earnings per Share (Tables)
 9 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings per Share
A reconciliation of the numerators and denominators of the basic and diluted per share computation follows.
 
 
Three Months Ended June 30,
 
Nine Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Basic:
 
 
 
 
 
 
 
 
Net income
 
$
17.5

 
$
10.2

 
$
44.4

 
$
0.8

Weighted average number of common shares outstanding during the period
 
76,797,414

 
76,743,853

 
76,795,551

 
76,745,396

    Net income per common share - basic
 
$
0.23

 
$
0.13

 
$
0.58

 
$
0.01

 
 
 
 
 
 
 
 
 
Diluted:
 
 
 
 
 
 
 
 
Net income
 
$
17.5

 
$
10.2

 
$
44.4

 
$
0.8

Denominator for diluted earnings per share:
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding during the period
 
76,797,414

 
76,743,853

 
76,795,551

 
76,745,396

Incremental common shares attributable to outstanding unvested restricted stock and unvested restricted stock units
 
185,936

 
85,015

 
157,207

 
84,900

Denominator for diluted earnings per common share
 
76,983,350

 
76,828,868

 
76,952,758

 
76,830,296

     Net income per common share - diluted
 
$
0.23

 
$
0.13

 
$
0.58

 
$
0.01