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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
12 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accumulated Other Comprehensive Income
The changes in the components of accumulated other comprehensive income (loss), net of taxes, was as follows:
(in millions)Foreign Currency TranslationDerivative InstrumentsDefined Benefit PensionTotal
Balance at September 30, 2018$(192.5)$7.4 $(50.7)$(235.8)
Other comprehensive (loss) income before reclassification(30.8)12.6 (27.6)(45.8)
Net reclassification for (gain) loss to income from continuing operations— (10.4)2.1 (8.3)
Net reclassification for (gain) loss to income from discontinued operations— (0.2)0.1 (0.1)
Other comprehensive (loss) income before tax(30.8)2.0 (25.4)(54.2)
Deferred tax effect(4.7)(5.4)4.1 (6.0)
Other comprehensive loss, net of tax(35.5)(3.4)(21.3)(60.2)
Sale and deconsolidation of GBL and GAC discontinued operations (Note 3)11.6 0.9 9.4 21.9 
Less: other comprehensive loss from continuing operations attributable to non-controlling interest(0.2)— — (0.2)
Less: other comprehensive loss from discontinued operations attributable to non-controlling interest(0.3)— — (0.3)
Other comprehensive loss attributable to controlling interest(23.4)(2.5)(11.9)(37.8)
Balance as of September 30, 2019(215.9)4.9 (62.6)(273.6)
Other comprehensive loss before reclassification (18.5)(6.2)(5.2)(29.9)
Net reclassification for (gain) loss to income from continuing operations— (4.6)4.6 — 
Net reclassification for gain to income from discontinued operations— (0.4)(0.3)(0.7)
Other comprehensive loss before tax(18.5)(11.2)(0.9)(30.6)
Deferred tax effect0.1 11.7 (0.3)11.5 
Other comprehensive (loss) income, net of tax(18.4)0.5 (1.2)(19.1)
Adoption of ASU 2018-02 (Note 2)— (1.8)2.1 0.3 
Sale and deconsolidation of Coevorden operations (Note 3)8.1 — — 8.1 
Less: other comprehensive income from continuing operations attributable to non-controlling interest0.1 — — 0.1 
Less: other comprehensive income from discontinued operations attributable to non-controlling interest0.3 — — 0.3 
Other comprehensive (loss) income attributable to controlling interest(10.7)(1.3)0.9 (11.1)
Balance as of September 30, 2020(226.6)3.6 (61.7)(284.7)
Other comprehensive income before reclassification32.2 0.1 11.7 44.0 
Net reclassification for loss to income from continuing operations— 9.2 4.8 14.0 
Net reclassification for loss (gain) to income from discontinued operations— 0.1 (0.1)— 
Other comprehensive income before tax32.2 9.4 16.4 58.0 
Deferred tax effect— (6.6)(1.6)(8.2)
Other comprehensive income, net of tax32.2 2.8 14.8 49.8 
Less: other comprehensive income from discontinued operations attributable to non-controlling interest0.4 — — 0.4 
Other comprehensive income attributable to controlling interest31.8 2.8 14.8 49.4 
Balance as of September 30, 2021$(194.8)$6.4 $(46.9)$(235.3)