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Revenue Recognition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Contract with Customer, Liability	$ 534.4		$ 512.5
Customer advances	407.2		382.0
Contract with customer other current liability	75.3		78.2
Contract with Customer, Liability, Noncurrent	51.9		$ 52.3
Contract with Customer, Liability, Revenue Recognized	172.9	$ 236.0
Defense
Disaggregation Of Revenue [Line Items]
Increase (decrease) in net sales due to margin rate adjustments	7.6	31.6
Increase (decrease) in operating income due to margin rate adjustments	3.8	30.3
Increase (decrease) in net income due to margin rate adjustments	$ 3.0	$ 23.2
Increase (decrease) in earnings per share due to margin rate adjustments (in dollars per share)	$ 0.04	$ 0.32
Fire and Emergency
Disaggregation Of Revenue [Line Items]
Interest Expense, Customer Deposits	$ 3.2	$ 3.6

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- Definition

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+ References

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Increase (decrease) in net sales due to margin rate adjustments for contracts accounted for using the percentage of completion method.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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The interest expense recognized during the period on customer deposits or security deposits held in interest bearing accounts.

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