Revenues - Remaining Performance Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2021
Remaining Performance Obligations
Revenue Recognized	$ 82.0
Contract assets		$ 93.8
Contract liabilities		108.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Remaining Performance Obligations
Remaining performance obligations amount		$ 592.0
Percentage of remaining performance obligation expected to be recognized		75.00%
Revenue remaining performance obligation expected timing of satisfaction, Period		12 months

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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

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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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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

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