Revenue Recognition - Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Disaggregation of Revenue [Abstract]
Short-Term Contract Assets, Beginning balance	$ 241.7
Increase (decrease) in Short-Term Contract Assets	9.4
Short-Term Contract Assets, Ending balance	251.1
Short-Term Contract Liabilities, Beginning balance	13.5
Increase (decrease) in Short-Term Contract Liabilities	(2.6)
Short-Term Contract Liabilities, Ending balance	$ 10.9