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ACCUMULATED OTHER COMPREHENSIVE INCOME - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 2,141.7 $ 2,518.3 $ 1,269.1
Other comprehensive income (loss) before reclassification 20.0 24.3 1.2
Net reclassification for loss (gain) to income 10.9 18.6  
Other comprehensive income (loss) before tax 30.9 42.9 16.4
Deferred tax effect 1.7 2.6 12.3
Other comprehensive income (loss), net of tax     28.7
Net change to derive comprehensive income for the periods 32.6 45.5 54.8
Balance at end of period 1,909.7 2,141.7 2,518.3
Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income     13.0
Other comprehensive income (loss), net of tax     28.7
Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income     2.2
Deconsolidation of discontinued operations     26.1
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (204.0) (249.4) (303.1)
Other comprehensive income (loss), net of tax     28.4
Net change to derive comprehensive income for the periods 32.1 45.4  
Other comprehensive income (loss) attributable to controlling interest 32.1 45.4 53.7
Balance at end of period (171.9) (204.0) (249.4)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (164.1) (216.1) (285.9)
Other comprehensive income (loss) attributable to controlling interest 23.8 52.0 69.8
Balance at end of period (140.3) (164.1) (216.1)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification 18.6 49.6 37.3
Net reclassification for loss (gain) to income 1.0 2.4  
Other comprehensive income (loss) before tax 19.6 52.0 37.3
Deferred tax effect 4.7 0.1 7.0
Net change to derive comprehensive income for the periods 24.3 52.1 70.9
Foreign Currency Translation | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive income (loss), net of tax     44.3
Foreign Currency Translation | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Deconsolidation of discontinued operations     26.6
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (2.2) 1.4 16.8
Other comprehensive income (loss) attributable to controlling interest 2.8 (3.6) (15.4)
Balance at end of period 0.6 (2.2) 1.4
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification (4.3) (20.0) (35.3)
Net reclassification for loss (gain) to income 7.9 15.2  
Other comprehensive income (loss) before tax 3.6 (4.8) (20.8)
Deferred tax effect (0.8) 1.2 5.4
Net change to derive comprehensive income for the periods 2.8 (3.6) (15.4)
Derivative Instruments | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income     12.2
Other comprehensive income (loss), net of tax     (15.4)
Derivative Instruments | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income     2.3
Deconsolidation of discontinued operations     0.0
Defined Benefit Pension      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (37.7) (34.7) (34.0)
Other comprehensive income (loss) attributable to controlling interest 5.5 (3.0) (0.7)
Balance at end of period (32.2) (37.7) (34.7)
Defined Benefit Pension      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification 5.7 (5.3) (0.8)
Net reclassification for loss (gain) to income 2.0 1.0  
Other comprehensive income (loss) before tax 7.7 (4.3) (0.1)
Deferred tax effect (2.2) 1.3 (0.1)
Net change to derive comprehensive income for the periods 5.5 (3.0) (0.7)
Defined Benefit Pension | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income     0.8
Other comprehensive income (loss), net of tax     (0.2)
Defined Benefit Pension | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income     (0.1)
Deconsolidation of discontinued operations     (0.5)
AOCI Attributable to Noncontrolling Interest      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from continuing operations attributable to non-controlling interest 0.5 0.1  
AOCI Attributable to Noncontrolling Interest | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from continuing operations attributable to non-controlling interest     0.3
AOCI Attributable to Noncontrolling Interest | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: deconsolidation of discontinued operations     0.8
Foreign Currency Translation, Noncontrolling Interest      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from continuing operations attributable to non-controlling interest $ 0.5 $ 0.1  
Foreign Currency Translation, Noncontrolling Interest | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from continuing operations attributable to non-controlling interest     0.3
Foreign Currency Translation, Noncontrolling Interest | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: deconsolidation of discontinued operations     $ 0.8