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Stock-based Compensation Plans (Tables)
 9 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-based Payment Arrangement, Activity [Table Text Block]
Number grantedWeighted average grant date fair value per instrumentTotal grant date fair value
(in millions)
Quarter ended December 31, 2019
    Restricted stock units162,433  $11.26  $1.8  
    Employee stock purchase plan instruments39,492  1.97  0.1  
    Phantom Plan awards188,973  11.26  2.1  
    PRSUs: 2020 award65,428  11.26  0.7  
    2019 award102,203  11.26  1.2  
    2018 award44,451  11.26  0.5  
    MRSUs147,213  14.94  2.2  
Quarter ended March 31, 2020
    Restricted stock units118,684  12.14  1.4  
    Employee stock purchase plan instruments53,876  2.09  0.1  
    PRSUs: 2020 award13,682  12.09  0.2  
    MRSUs10,261  17.79  0.2  
Quarter ended June 30, 2020:
    Restricted stock units2,118  9.20  —  
    Employee stock purchase plan instruments48,282  3.64  0.2  
$10.7  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The table below provides information regarding MRSU awards, which were valued using Monte Carlo simulations on the dates the units were granted.
December 3, 2019January 28, 2020February 24, 2020
Fair Value at grant date$14.94  $16.76  $18.17  
Units granted147,213  2,763  7,498  
Variables used in determining grant date fair value:
Dividend yield1.87 %1.76 %1.73 %
Risk-free rate1.53 %1.44 %1.23 %
Expected term (in years)2.832.672.60