Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013
Other current liabilities
Unrealized losses on foreign exchange contracts	$ 21.4	$ 5.8
Product warranty obligations	32.5	34.1	37.0	36.9
Taxes other than income taxes	32.2	37.2
Accrued interest	17.4	15.6
Income taxes payable	33.9	41.0
Other	49.4	54.6
Other current liabilities	$ 186.8	$ 188.3