Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Revenue Recognition (Details)

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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Net revenue $ 2,940.9 $ 2,864.8 $ 2,517.0
Retained earnings 812.0 666.2  
Receivables from long-term manufacturing contracts 213.3 121.9  
Inventories 533.8 411.6  
Cost of goods sold 1,986.3 1,907.5 1,703.7
Gross profit 954.6 957.3 813.3
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 314.0 353.8 (18.5)
Consolidated net income (loss) $ 215.2 255.2 (53.4)
Contract with customer, liability, revenue recognized   $ 203.8 $ 154.2