Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Other current liabilities
Unrealized losses on foreign exchange contracts	$ 13.0	$ 16.4
Product warranty obligations (Note 7)	27.6	27.9	$ 33.6	$ 34.1
Taxes other than income taxes	40.0	34.9
Accrued interest	16.2	16.9
Income taxes payable	74.7	50.9
Other	57.8	61.0
Other current liabilities	$ 229.3	$ 208.0