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EQUITY (Tables)
 12 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Schedule of Authorized and Issued Shares Authorized and issued shares consisted of the following (in millions):
September 30,
20232022
Preferred shares, no par value:
Authorized0.2 shares0.2 shares
Issued0.0 shares0.0 shares
Common shares, no par value, $0.01 stated value per share:
Authorized100.0 shares100.0 shares
Issued68.1 shares68.1 shares
Schedule of Accumulated Other Comprehensive Loss
Changes in AOCL by component were as follows for the fiscal years ended September 30:
 Foreign
Currency
Translation
Adjustments		Net Unrealized
Gain (Loss)
On Derivative
Instruments		Net
Unrealized
Loss On
Securities		Pension and
Other Post-
Retirement
Benefit
Adjustments		Accumulated
Other
Comprehensive
Income (Loss)
Balance at September 30, 2020$(6.2)$(15.1)$— $(77.8)$(99.1)
Other comprehensive income (loss) before reclassifications4.5 26.8 (3.1)6.9 35.1 
Amounts reclassified from accumulated other comprehensive net income (loss)— 7.3 — 0.4 7.7 
Income tax benefit (expense)— (8.9)0.8 (1.9)(10.0)
Net current period other comprehensive income (loss)4.5 25.2 (2.3)5.4 32.8 
Balance at September 30, 2021(1.7)10.2 (2.3)(72.5)(66.4)
Other comprehensive income (loss) before reclassifications(27.2)40.1 (102.0)(7.3)(96.4)
Amounts reclassified from accumulated other comprehensive net income (loss)— (9.1)— 11.7 2.6 
Income tax benefit (expense)— (7.9)24.6 (1.1)15.6 
Net current period other comprehensive income (loss)(27.2)23.1 (77.4)3.3 (78.2)
Balance at September 30, 2022(28.9)33.3 (79.7)(69.3)(144.6)
Other comprehensive income (loss) before reclassifications7.0 5.6 (34.9)(2.5)(24.8)
Amounts reclassified from accumulated other comprehensive net income (loss)— (23.3)101.3 (1.6)76.4 
Income tax benefit (expense)— 4.5 (25.3)1.0 (19.8)
Net current period other comprehensive income (loss)7.0 (13.2)41.1 (3.1)31.8 
Balance at September 30, 2023$(21.9)$20.1 $(38.6)$(72.4)$(112.8)
The sum of the components may not equal due to rounding.
Schedule of Share-Based Compensation Total share-based compensation was as follows for each of the periods indicated:
 Year Ended September 30,
 202320222021
Share-based compensation$68.1 $30.3 $40.6 
Related tax benefit recognized15.6 4.9 7.4 
Schedule of Aggregate Stock Option Activity Stock option activity was as follows:
No. of
  Options		Wtd. Avg.
Exercise Price		Wtd Avg
Remaining Life		Aggregate
Intrinsic Value
Awards outstanding at September 30, 2022528,471 $110.86 4.4 years
Granted696,268 52.54 
Forfeited(33,556)115.53 
Awards outstanding at September 30, 20231,191,183 76.64 6.6 years$0.8 
Exercisable399,223 66.24 2.2 years— 
Schedule of Share-Based Awards Granted The weighted average assumptions for awards granted in fiscal 2023 are as follows:
Expected volatility36.8 %
Risk-free interest rate4.3 %
Expected dividend yield3.9 %
Expected life6.1 years
Schedule of Restricted Share-Based Award Activity
Restricted share-based award activity (including restricted stock units and deferred stock units) was as follows:
No. of
Units		Wtd. Avg.
Grant Date
Fair Value
per Unit
Awards outstanding at September 30, 2022320,575 $143.19 
Granted479,787 59.48 
Vested(140,334)112.64 
Forfeited(48,190)85.48 
Awards outstanding at September 30, 2023611,838 89.10 
Schedule of Performance-Based Award Activity
Performance-based award activity was as follows (based on target award amounts):
No. of
Units		Wtd. Avg.
Grant Date
Fair Value
per Unit
Awards outstanding at September 30, 2022113,256 $130.94 
Granted707,665 66.00 
Vested (a)
(250,586)69.16 
Forfeited(25,545)91.56 
Awards outstanding at September 30, 2023544,790 76.85 
(a)Vested at a weighted average of 102% of the target performance share units granted.