Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Assets, Current [Abstract]
Cash and cash equivalents	$ 526.7	$ 23.4
Receivables, net	71.9	66.1
Inventories, net	34.1	29.4
Prepaid expenses and other current assets	30.3	38.0
Short-term investments	424.1	0.0
Current assets held for sale	0.0	1,464.2
Total current assets	1,087.1	1,621.1
Noncurrent assets
Property, plant and equipment, net	761.6	668.6
Operating lease assets	264.3	248.1
Goodwill and intangibles, net	678.0	663.1
Other noncurrent assets	194.5	215.9
Total noncurrent assets	1,898.4	1,795.7
Total assets	2,985.5	3,416.8
Current liabilities
Current portion of long-term debt	23.7	162.5
Trade and other payables	96.4	45.0
Accrued expenses and other liabilities	285.8	172.6
Current liabilities held for sale	0.0	539.3
Total current liabilities	405.9	919.4
Noncurrent liabilities
Long-term debt	1,567.8	1,525.1
Employee benefit obligations	202.1	199.4
Operating lease liabilities	245.0	229.2
Other noncurrent liabilities	279.3	237.1
Total noncurrent liabilities	2,294.2	2,190.8
Commitments and contingencies
Stockholders’ equity
Preferred stock, no par value, 40 shares authorized; no shares issued and outstanding	0.0	0.0
Common stock, par value $0.01 per share, 400.0 shares authorized; 138.7 and 176.1 shares issued and outstanding at June 30, 2023 and September 30, 2022, respectively	1.4	1.8
Paid-in capital	44.8	44.1
Retained earnings	222.2	282.0
Accumulated other comprehensive income (loss)	17.0	(21.3)
Total stockholders’ equity	285.4	306.6
Total liabilities and stockholders’ equity	$ 2,985.5	$ 3,416.8