Unaudited Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Sep. 30, 2018	[1]	Jun. 30, 2018	[2]	Mar. 31, 2018	[3]	Dec. 31, 2017	[4]	Sep. 30, 2017	[5]	Jun. 30, 2017	[6]	Mar. 31, 2017	[7]	Dec. 31, 2016	[8]	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 2,057.0		$ 2,175.8		$ 1,886.4		$ 1,586.3		$ 1,963.0		$ 2,036.9		$ 1,618.3		$ 1,211.4		$ 7,705.5	$ 6,829.6	$ 6,279.2
Gross income	375.2		402.9		335.4		242.2		326.5		386.9		261.3		199.7		1,355.7	1,174.4	1,055.8
Operating income	201.4		222.4		155.9		73.8		134.5		211.9		80.4		36.2		653.5	463.0	364.0
Net income	$ 151.3		$ 153.4		$ 110.8		$ 56.4		$ 93.5		$ 128.6		$ 44.3		$ 19.2		$ 471.9	$ 285.6	$ 216.4
Earnings per share:
Total earnings (loss) per share-basic (in dollars per share)	$ 2.08		$ 2.08		$ 1.49		$ 0.75		$ 1.25		$ 1.72		$ 0.59		$ 0.26		$ 6.38	$ 3.82	$ 2.94
Earnings per share-diluted:
Total earnings (loss) per share -diluted (in dollars per share)	2.05		2.05		1.47		0.74		1.23		1.69		0.58		0.26		$ 6.29	$ 3.77	$ 2.91
Common Stock per share dividends (in dollars per share)	$ 0.24		$ 0.24		$ 0.24		$ 0.24		$ 0.21		$ 0.21		$ 0.21		$ 0.21

[1] The fourth quarter of fiscal 2018 was impacted by restructuring-related charges of $2.5 million ($2.1 million after-tax) in the access equipment and commercial segments, a gain of $19.0 million ($15.4 million after-tax) for a litigation settlement in the defense segment, business interruption insurance proceeds of $6.6 million ($4.9 million after-tax) in the commercial segment, a loss on the sale of a small product line of $1.4 million ($1.0 million after-tax) in the commercial segment and a tax benefit related to tax reform in the U.S. of $2.0 million.

[2] The third quarter of fiscal 2018 was impacted by restructuring-related charges of $6.6 million ($5.0 million after-tax) in the access equipment segment, debt extinguishment costs of $9.9 million ($7.7 million after-tax) and a tax benefit related to tax reform in the U.S. of $2.2 million.

[3] The second quarter of fiscal 2018 was impacted by restructuring-related charges of $7.0 million ($5.8 million after-tax) in the access equipment and commercial segments.

[4] The first quarter of fiscal 2018 was impacted by restructuring-related charges of $18.8 million ($14.2 million after-tax) in the access equipment and commercial segments and a tax benefit related to tax reform in the U.S. of $6.5 million.

[5] The fourth quarter of fiscal 2017 was impacted by restructuring-related charges of $15.8 million ($11.5 million after-tax) in the access equipment segment.

[6] The third quarter of fiscal 2017 was impacted by restructuring-related charges of $11.1 million ($11.5 million after-tax) in the access equipment segment.

[7] The second quarter of fiscal 2017 was impacted by restructuring-related charges of $17.6 million ($14.0 million after-tax) in the access equipment segment.

[8] The first quarter of fiscal 2017 was impacted by restructuring-related charges of $0.7 million ($0.4 million after-tax) in the access equipment segment.