Other Current Liabilities - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Other current liabilities
Unrealized losses on foreign exchange contracts	$ 15.8	$ 16.9
Product warranty obligations	17.7	18.0
Taxes other than income taxes	74.3	59.8
Accrued interest	38.2	17.8
Income taxes payable	109.9	188.4
Operating lease liabilities	89.7	89.9
Other	99.9	93.6
Other current liabilities	$ 445.5	$ 484.4