Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net income (loss)	[1]	$ 68.0	$ (220.5)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	[1]	38.7	52.3
Stock-based compensation	[1]	2.8	4.9
Certain interest expense and other financing costs	[1]	1.3	2.9
Gain on sale of fixed assets and other	[1]	(1.6)	(0.6)
Deferred income taxes	[1]	1.6	(85.9)
Loss on sale of business	[1],[2]	22.3	355.4
Changes in operating assets and liabilities:
Accounts receivable	[1]	137.6	149.6
Inventories	[1]	(89.1)	(89.3)
Prepaid expenses and other current assets	[1]	(26.2)	18.0
Accounts payable and accrued expenses	[1]	(102.6)	(227.5)
Other assets and liabilities	[1]	(3.2)	1.6
Net cash provided by (used in) operating activities	[1]	49.6	(39.1)
Investing Activities
Purchases of property and equipment	[1]	(23.3)	(18.0)
Acquisition of business, net	[1]	(89.0)
Proceeds from sale of business	[1],[2]	35.8
Proceeds from the sale of assets	[1]	1.7	0.7
Net cash provided by (used in) investing activities	[1]	(74.8)	(17.3)
Financing Activities
Borrowings under revolving lines of credit	[1]		2.3
Payments under revolving lines of credit	[1]		(102.3)
Payments under term loan	[1]	(2.5)	(2.4)
Payments under equipment financing facilities and finance leases	[1]	(1.4)	(1.7)
Payment of dividends on Preferred Stock	[1]	(6.0)	(6.0)
Proceeds from issuance of common stock related to equity awards	[1]	5.2	7.1
Payment of taxes related to net share settlement of equity awards	[1]	(4.4)	(2.8)
Net cash provided by (used in) financing activities	[1]	(9.1)	(105.8)
Effect of exchange rate changes on cash and cash equivalents	[1]	0.1	(1.0)
Net increase (decrease) in cash and cash equivalents	[1]	(34.2)	(163.2)
Cash and cash equivalents, beginning of period	[1]	260.0	624.6
Cash and cash equivalents, end of period	[1]	225.8	461.4
Supplemental Cash Flow Information
Operating cash flows provided by (used in) discontinued operations	[1]		(6.4)
Investing cash flows provided by (used in) discontinued operations	[1]		(2.5)
Cash paid during the period for:
Interest	[1]	22.2	47.1
Income taxes, net of refunds	[1],[3]	$ 40.6	$ 2.0

[1] Unless otherwise noted, amounts include both continuing and discontinued operations.

[2] See Note 4 for additional information.

[3] Three months ended December 31, 2021 amount includes $9.9 million related to the Interior Products divestiture.