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Share-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2025
Compensation Related Costs [Abstract]  
Schedule of stock-based compensation costs
 Year Ended September 30,
 202520242023
Stock-based compensation cost$17.9 $20.3 $22.2 
Less impact of income tax4.2 4.7 5.1 
Stock-based compensation cost, net of tax$13.7 $15.6 $17.1 
Summary of assumptions used in determining fair value of options
The Company estimates the fair value of TSR awards using a Monte-Carlo simulation model which included the following key assumptions:

 Year Ended Year Ended September 30,
 202520242023
Expected term (years)2.832.832.83
Risk-free interest rate4.06 %4.28 %3.96 %
Share price volatility36.00 %32.40 %44.70 %
Expected dividend yield— %— %— %
Actual dividend yield2.24 %1.95 %1.97 %
Summary of outstanding stock options
A summary of outstanding stock option awards as of September 30, 2025 and changes during the year is presented below:
 
Number
of Shares		Weighted-Average
Exercise Price
Outstanding at September 30, 2023627,609 $38.56 
Granted— — 
Exercised(68,140)35.85 
Forfeited— — 
Expired/cancelled(5,578)37.15 
Outstanding at September 30, 2024553,891 38.91 
Granted— — 
Exercised(31,163)32.16 
Forfeited— — 
Expired/cancelled(6,946)33.58 
Outstanding at September 30, 2025515,782 $39.39 
Exercisable at September 30, 2025515,782 $39.39 
Summary of outstanding restricted stock units
A summary of the non-vested stock awards, including dividends, as of September 30, 2025 (representing the maximum number of shares that could be vested) and changes during the year is presented below:
 
Number of SharesWeighted-Average
Grant Date
Fair Value
Time-Based Stock Awards 
Non-vested time-based stock awards at September 30, 2023498,736 $46.91 
Granted360,823 39.76 
Vested(260,712)45.51 
Forfeited(52,159)44.51 
Non-vested time-based stock awards at September 30, 2024546,688 43.09 
Granted496,662 31.76 
Vested(294,884)44.13 
Forfeited(124,037)34.88 
Non-vested time-based stock awards at September 30, 2025624,429 $35.22 
Summary of outstanding performance-based units
Number of SharesWeighted-Average
Grant Date
Fair Value
Performance-Based Stock Awards 
Non-vested performance-based stock awards at September 30, 2022582,476 $59.90 
Granted482,914 42.18 
Vested(48,268)46.18 
Forfeited(259,062)53.90 
Non-vested performance-based stock awards at September 30, 2024758,060 51.54 
Granted611,670 40.04 
Vested(16,105)51.61 
Forfeited(446,995)58.01 
Non-vested performance-based stock awards at September 30, 2025906,630 $40.57