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Revenue - Unearned Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Unearned Revenue (Details)
Unearned Revenue	$ 38.0	$ 25.7	$ 38.0	$ 25.7	$ 35.0	$ 27.9	$ 23.0	$ 21.6
Contract with Customer, Liability, Revenue Recognized	$ 8.3	$ 5.9	$ 13.3	$ 10.6

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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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