Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net income	$ 31.9	$ 81.9
Adjustments to reconcile net income to cash flows from operating activities:
Loss (income) from discontinued operations	2.0	(54.9)
Depreciation and amortization	24.6	18.5
Deferred income taxes	0.0	(26.5)
Stock-based compensation expense	2.4	2.9
Other, net	1.0	0.6
Change in operating assets and liabilities
Receivables	2.4	13.4
Inventories	3.0	(1.0)
Payables and accrued liabilities	(43.7)	(17.2)
Other assets and liabilities	(1.7)	30.8
Operating cash flows from continuing operations	21.9	48.5
Operating cash flows from discontinued operations	(2.0)	(57.2)
Total cash provided by (used in) operating activities	19.9	(8.7)
Cash flows from investing activities
Additions to property, plant and equipment	(42.3)	(39.9)
Acquisitions of businesses	(8.3)	(9.6)
Proceeds from maturities of short-term investments	230.0	0.0
Other investing activities, net	(7.1)	1.1
Investing cash flows from continuing operations	172.3	(48.4)
Investing cash flows from discontinued operations	0.0	(8.4)
Total cash provided by (used in) investing activities	172.3	(56.8)
Cash flows from financing activities
Proceeds from borrowings	0.0	250.0
Repayments on borrowings	(5.9)	(119.4)
Repurchases of common stock	(171.7)	(87.4)
Cash dividends paid	0.0	(21.8)
Other financing activities	(7.1)	(8.9)
Financing cash flows from continuing operations	(184.7)	12.5
Financing cash flows from discontinued operations	0.0	60.0
Total cash (used in) provided by financing activities	(184.7)	72.5
Effect of currency exchange rate changes on cash, cash equivalents and restricted cash	0.1	2.1
Increase (decrease) in cash, cash equivalents, and restricted cash	7.6	9.1
Cash, cash equivalents, and restricted cash - beginning of period	413.1	83.9
Cash, cash equivalents, and restricted cash - end of period	$ 420.7	$ 93.0