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, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Net revenue $ 2,864.8 $ 2,517.0 $ 1,807.3
Retained earnings 666.2 481.4  
Receivables from long-term manufacturing contracts 121.9 138.1  
Inventories 411.6 385.4  
Cost of Goods and Services Sold 1,907.5 1,703.7 1,184.3
Gross profit 957.3 813.3 623.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 353.8 (18.5) 176.7
Consolidated net income (loss) $ 255.2 (53.4) 126.2
Contract with customer, liability, revenue recognized   $ 154.2 $ 128.4