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Stock-based Compensation Plans (Tables)
 9 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-based Payment Arrangement, Activity [Table Text Block]
 
 
Number granted
 
Weighted average grant date fair value per instrument
 
Total grant date fair value
(in millions)
Quarter ended December 31, 2018:
 
 
 
 
 
 
Restricted stock units
 
147,409

 
$
10.53

 
$
1.6

Employee stock purchase plan instruments
 
45,464

 
2.30

 
0.1

Phantom Plan awards
 
168,380

 
10.53

 
1.8

PRSUs: 2019 award
 
110,595

 
10.53

 
1.2

2018 award
 
49,236

 
10.53

 
0.5

2017 award
 
31,229

 
10.53

 
0.3

 
 
 
 
 
 
 
Quarter ended March 31, 2019:
 
 
 
 
 
 
Restricted stock units
 
76,919

 
9.35

 
0.7

Employee stock purchase plan instruments
 
43,139

 
2.50

 
0.1

 
 
 
 
 
 
 
Quarter ended June 30, 2019:
 
 
 
 
 
 
Restricted stock units
 
4,854

 
9.27

 
—

Employee stock purchase plan instruments
 
42,890

 
1.88

 
0.1

 
 
 
 
 
 
$
6.4