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Stock-based Compensation Plans (Tables)
6 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement, Noncash Expense [Abstract]  
Share-based Payment Arrangement, Activity [Table Text Block] Grants issued during the six months ended March 31, 2024 are as follows:
Number grantedWeighted average grant date fair value per instrumentTotal grant date fair value
(in millions)
Quarter ended December 31, 2023
MRSUs136,983 $18.11 $2.5 
PRSUs136,983 13.22 1.8 
Restricted stock units161,943 13.27 2.1 
Phantom Plan instruments230,523 13.22 3.0 
Non-qualified stock options457,356 3.96 1.8 
Employee stock purchase plan instruments31,139 $3.48 0.1 
Total - Quarter ended December 31, 2023$11.3 
Quarter ended March 31, 2024
Restricted stock units81,136 $15.59 $1.3 
Phantom Plan instruments2,544 15.71 — 
Employee stock purchase plan instruments35,998 $2.62 0.1 
Total - Quarter ended March 31, 20241.4 
Total - Year-to-date ended March 31, 2024$12.7 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The assumptions used to determine the grant date fair value are indicated below for awards granted to date during the current fiscal year.
November 28, 2023
Variables used in determining grant date fair value:
Dividend yield2.00%
Risk-free rate4.50%
Expected term (in years)2.84
The assumptions used to determine the grant date fair value are indicated below for awards granted to date during the current fiscal year.
November 28, 2023
Variables used in determining grant date fair value:
Dividend yield1.94%
Risk-free rate4.33%
Expected term (in years)6.00