BUSINESS SEGMENT INFORMATION - Additional Segment Information (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Sep. 30, 2025	Oct. 31, 2024	Oct. 31, 2023
Depreciation, depletion and amortization expense:
Total depreciation, depletion and amortization expense	$ 236.9	$ 261.3	$ 230.6
Continuing Operations
Depreciation, depletion and amortization expense:
Total depreciation, depletion and amortization expense	212.7	227.7	198.0
Capital expenditures:
Total capital expenditures	107.5	124.3	170.1
Customized Polymer Solutions | Continuing Operations
Depreciation, depletion and amortization expense:
Total depreciation, depletion and amortization expense	86.3	79.3	47.4
Durable Metal Solutions | Continuing Operations
Depreciation, depletion and amortization expense:
Total depreciation, depletion and amortization expense	25.6	29.1	28.7
Sustainable Fiber Solutions | Continuing Operations
Depreciation, depletion and amortization expense:
Total depreciation, depletion and amortization expense	91.8	106.6	109.4
Integrated Solutions | Continuing Operations
Depreciation, depletion and amortization expense:
Total depreciation, depletion and amortization expense	9.0	12.7	12.5
Operating Segments | Continuing Operations
Capital expenditures:
Total capital expenditures	106.1	122.5	152.1
Operating Segments | Customized Polymer Solutions | Continuing Operations
Capital expenditures:
Total capital expenditures	37.3	46.1	37.7
Operating Segments | Durable Metal Solutions | Continuing Operations
Capital expenditures:
Total capital expenditures	19.2	25.7	32.1
Operating Segments | Sustainable Fiber Solutions | Continuing Operations
Capital expenditures:
Total capital expenditures	44.4	44.8	70.2
Operating Segments | Integrated Solutions | Continuing Operations
Capital expenditures:
Total capital expenditures	5.2	5.9	12.1
Corporate and other | Continuing Operations
Capital expenditures:
Total capital expenditures	$ 1.4	$ 1.8	$ 18.0