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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 1,415.8 $ 1,728.9 $ 1,589.6
Other comprehensive (loss) income before reclassification 44.0 (29.9) (45.8)
Other comprehensive (loss) income before tax 58.0 (30.6) (54.2)
Deferred tax effect (8.2) 11.5 (6.0)
Other comprehensive (loss) income, net of tax 49.8 (19.1) (60.2)
Other comprehensive (loss) income attributable to controlling interest 49.4 (11.1) (37.8)
Balance at end of period 1,479.0 1,415.8 1,728.9
Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   0.0 (3.1)
Balance at end of period     0.0
GBL and GAC Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation     21.9
Coevorden Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation   8.1  
Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 14.0 0.0 (8.3)
Less: other comprehensive income (loss) attributable to non-controlling interest   0.1 (0.2)
Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 0.0 (0.7) (0.1)
Less: other comprehensive income (loss) attributable to non-controlling interest 0.4 0.3 (0.3)
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (284.7) (273.6) (235.8)
Balance at end of period (235.3) (284.7) (273.6)
Total | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   0.3  
Balance at end of period     0.3
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (226.6) (215.9) (192.5)
Other comprehensive (loss) income before reclassification 32.2 (18.5) (30.8)
Other comprehensive (loss) income before tax 32.2 (18.5) (30.8)
Deferred tax effect 0.0 0.1 (4.7)
Other comprehensive (loss) income, net of tax 32.2 (18.4) (35.5)
Other comprehensive (loss) income attributable to controlling interest 31.8 (10.7) (23.4)
Balance at end of period (194.8) (226.6) (215.9)
Foreign Currency Translation | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   0.0  
Balance at end of period     0.0
Foreign Currency Translation | GBL and GAC Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation     11.6
Foreign Currency Translation | Coevorden Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation   8.1  
Foreign Currency Translation | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 0.0 0.0 0.0
Less: other comprehensive income (loss) attributable to non-controlling interest   0.1 (0.2)
Foreign Currency Translation | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 0.0 0.0 0.0
Less: other comprehensive income (loss) attributable to non-controlling interest 0.4 0.3 (0.3)
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 3.6 4.9 7.4
Other comprehensive (loss) income before reclassification 0.1 (6.2) 12.6
Other comprehensive (loss) income before tax 9.4 (11.2) 2.0
Deferred tax effect (6.6) 11.7 (5.4)
Other comprehensive (loss) income, net of tax 2.8 0.5 (3.4)
Other comprehensive (loss) income attributable to controlling interest 2.8 (1.3) (2.5)
Balance at end of period 6.4 3.6 4.9
Derivative Instruments | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   (1.8)  
Balance at end of period     (1.8)
Derivative Instruments | GBL and GAC Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation     0.9
Derivative Instruments | Coevorden Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation   0.0  
Derivative Instruments | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 9.2 (4.6) (10.4)
Less: other comprehensive income (loss) attributable to non-controlling interest   0.0 0.0
Derivative Instruments | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 0.1 (0.4) (0.2)
Less: other comprehensive income (loss) attributable to non-controlling interest 0.0 0.0 0.0
Defined Benefit Pension      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (61.7) (62.6) (50.7)
Other comprehensive (loss) income before reclassification 11.7 (5.2) (27.6)
Other comprehensive (loss) income before tax 16.4 (0.9) (25.4)
Deferred tax effect (1.6) (0.3) 4.1
Other comprehensive (loss) income, net of tax 14.8 (1.2) (21.3)
Other comprehensive (loss) income attributable to controlling interest 14.8 0.9 (11.9)
Balance at end of period (46.9) (61.7) (62.6)
Defined Benefit Pension | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period   2.1  
Balance at end of period     2.1
Defined Benefit Pension | GBL and GAC Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation     9.4
Defined Benefit Pension | Coevorden Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Sale and deconsolidation of discontinued operation   0.0  
Defined Benefit Pension | Continuing Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income 4.8 4.6 2.1
Less: other comprehensive income (loss) attributable to non-controlling interest   0.0 0.0
Defined Benefit Pension | Discontinued Operations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net reclassification for (gain) loss to income (0.1) (0.3) 0.1
Less: other comprehensive income (loss) attributable to non-controlling interest $ 0.0 $ 0.0 $ 0.0