CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Consolidated net income (loss)	$ 215.2	$ 255.2	$ (53.4)
Adjustments to reconcile consolidated net income (loss) to cash provided by operating activities:
Depreciation and amortization	108.2	115.1	130.6
Impairment charges	0.0	11.2	144.8
Deferred income taxes	23.5	12.2	(19.5)
Amortization of deferred financing costs	3.6	7.2	3.9
Share-based compensation	21.3	19.7	14.0
Settlement of Milacron share-based equity awards	0.0	0.0	5.9
Loss (gain) on divestitures	3.1	(67.1)	3.5
Trade receivables and receivables from long-term manufacturing contracts	(115.9)	(24.2)	91.7
Inventories	(125.5)	(33.4)	58.5
Prepaid expenses and other current assets	(23.2)	(1.7)	19.0
Trade accounts payable	105.5	91.3	(68.2)
Liabilities from long-term manufacturing contracts and advances, accrued compensation, and other current liabilities	(14.1)	148.2	(2.5)
Income taxes payable	7.9	(5.9)	16.4
Defined benefit plan funding	(10.5)	(11.6)	(12.4)
Defined benefit plan expense	1.7	3.1	6.8
Other, net	(9.7)	9.1	15.7
Net cash provided by operating activities	191.1	528.4	354.8
Investing Activities
Capital expenditures	(50.3)	(40.0)	(35.9)
Proceeds from sales of property, plant, and equipment	2.0	0.2	21.2
Acquisitions of businesses, net of cash acquired	(90.6)	0.0	(1,503.1)
Proceeds from divestitures, net of cash divested	(4.5)	165.8	221.9
Net cash (used in) provided by investing activities	(143.4)	126.0	(1,295.9)
Financing Activities
Proceeds from long-term debt, net of discount	0.0	350.0	1,125.2
Repayments of long-term debt	0.0	(688.8)	(186.3)
Proceeds from revolving credit facility	83.0	395.0	1,351.7
Repayments on revolving credit facility	(74.3)	(395.0)	(1,353.9)
Payment of deferred financing costs	(3.7)	(5.4)	(14.7)
Payment of dividends on common stock	(62.0)	(64.0)	(63.4)
Repurchases of common stock	(203.9)	(121.1)	0.0
Proceeds from stock option exercises and other	25.3	13.1	1.2
Payments for employee taxes on net settlement equity awards	(7.0)	(3.5)	(1.9)
Other, net	(1.6)	(3.6)	(3.0)
Net cash (used in) provided by financing activities	(244.2)	(523.3)	854.9
Effect of exchange rate changes on cash and cash equivalents	(16.8)	8.0	(1.4)
Net cash flows	(213.3)	139.1	(87.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
At Beginning of Period	450.9	311.8	399.4
At End of Period	237.6	450.9	311.8
Cash paid for interest	62.6	63.2	56.7
Cash paid for income taxes	71.5	93.2	39.2
Cash, cash equivalents, and restricted cash:
Cash and cash equivalents	234.1	446.1
Short-term restricted cash included in other current assets	3.5	1.3
Cash and cash equivalents held for sale	0.0	3.5
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows	$ 237.6	$ 450.9	$ 311.8