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ACCUMULATED OTHER COMPREHENSIVE INCOME - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 1,269.1 $ 1,479.0 $ 1,415.8
Net change to derive comprehensive income for the periods 54.8 (68.7) 49.8
Balance at end of period 2,518.3 1,269.1 1,479.0
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (303.1) (235.3) (284.7)
Other comprehensive income (loss) before reclassification 1.2 (23.0) 44.0
Other Comprehensive Income (Loss), before Tax 16.4 (42.1) 58.0
Other Comprehensive Income (Loss), Tax 12.3 (26.6) (8.2)
Net change to derive comprehensive income for the periods 54.8 (68.7) 49.8
Other comprehensive income (loss) attributable to controlling interest 53.7 (67.8) 49.4
Balance at end of period (249.4) (303.1) (235.3)
Total | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income 13.0 (16.6) 14.0
Net change to derive comprehensive income for the periods 28.7    
Total | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income 2.2 (2.5)  
Net change to derive comprehensive income for the periods 26.1    
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (285.9) (194.8) (226.6)
Other comprehensive income (loss) before reclassification 37.3 (72.0) 32.2
Other Comprehensive Income (Loss), before Tax 37.3 (72.0) 32.2
Other Comprehensive Income (Loss), Tax 7.0 (20.0) 0.0
Net change to derive comprehensive income for the periods 70.9 (92.0) 32.2
Other comprehensive income (loss) attributable to controlling interest 69.8 (91.1) 31.8
Balance at end of period (216.1) (285.9) (194.8)
Foreign Currency Translation | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net change to derive comprehensive income for the periods 44.3    
Foreign Currency Translation | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net change to derive comprehensive income for the periods 26.6    
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 16.8 6.4 3.6
Other comprehensive income (loss) before reclassification (35.3) 30.7 0.1
Other Comprehensive Income (Loss), before Tax (20.8) 8.1 9.4
Other Comprehensive Income (Loss), Tax 5.4 2.3 (6.6)
Net change to derive comprehensive income for the periods (15.4) 10.4 2.8
Other comprehensive income (loss) attributable to controlling interest (15.4) 10.4 2.8
Balance at end of period 1.4 16.8 6.4
Derivative Instruments | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income 12.2 (20.2) 9.2
Net change to derive comprehensive income for the periods (15.4)    
Derivative Instruments | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income 2.3 (2.4) 0.1
Net change to derive comprehensive income for the periods 0.0    
Defined Benefit Pension      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (34.0) (46.9) (61.7)
Other comprehensive income (loss) before reclassification (0.8) 18.3 11.7
Other Comprehensive Income (Loss), before Tax (0.1) 21.8 16.4
Other Comprehensive Income (Loss), Tax (0.1) (8.9) (1.6)
Net change to derive comprehensive income for the periods (0.7) 12.9 14.8
Other comprehensive income (loss) attributable to controlling interest (0.7) 12.9 14.8
Balance at end of period (34.7) (34.0) (46.9)
Defined Benefit Pension | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for loss (gain) to income 0.8 3.6 4.8
Net change to derive comprehensive income for the periods (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) (0.1) (0.1)
Net change to derive comprehensive income for the periods (0.5)    
AOCI Attributable to Noncontrolling Interest | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from operations attributable to non-controlling interest   (0.4)  
AOCI Attributable to Noncontrolling Interest | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from operations attributable to non-controlling interest 0.3 (0.5) 0.4
Less: Deconsolidation of discontinued operations 0.8    
Foreign Currency Translation, Noncontrolling Interest | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from operations attributable to non-controlling interest   (0.4)  
Foreign Currency Translation, Noncontrolling Interest | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Less: other comprehensive income (loss) from operations attributable to non-controlling interest 0.3 $ (0.5) $ 0.4
Less: Deconsolidation of discontinued operations $ 0.8