Revenue Recognition - Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities (Details) $ in Millions	6 Months Ended
	Mar. 31, 2023 USD ($)
Disaggregation of Revenue [Abstract]
Short-Term Contract Assets, Beginning balance	$ 244.0
Increase in Short-Term Contract Assets	13.9
Short-Term Contract Assets, Ending balance	257.9
Short-Term Contract Liabilities, Beginning balance	13.9
Increase (Decrease) in Short-Term Contract Liabilities	(1.6)
Short-Term Contract Liabilities, Ending balance	$ 12.3