CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 6,279.2	$ 6,098.1	$ 6,808.2
Cost of sales	5,223.4	5,058.9	5,625.5
Gross income	1,055.8	1,039.2	1,182.7
Operating expenses:
Selling, general and administrative	612.4	587.4	624.1
Amortization of purchased intangibles	52.5	53.2	55.3
Asset impairment charge	26.9	0.0	0.0
Total operating expenses	691.8	640.6	679.4
Operating income	364.0	398.6	503.3
Other income (expense):
Interest expense	(60.4)	(70.1)	(71.4)
Interest income	2.1	2.5	2.0
Miscellaneous, net	1.3	(4.9)	(2.0)
Income before income taxes and equity in earnings of unconsolidated affiliates	307.0	326.1	431.9
Provision for income taxes	92.4	99.2	125.0
Income before equity in earnings of unconsolidated affiliates	214.6	226.9	306.9
Equity in earnings of unconsolidated affiliates	1.8	2.6	2.4
Net income	$ 216.4	$ 229.5	$ 309.3
Earnings per share attributable to common shareholders:
Total earnings (loss) per share-basic (in dollars per share)	$ 2.94	$ 2.94	$ 3.66
Total earnings (loss) per share -diluted (in dollars per share)	$ 2.91	$ 2.90	$ 3.61