Receivables (Details 2) $ in Millions	3 Months Ended																12 Months Ended
	Sep. 30, 2018 USD ($) Party		Jun. 30, 2018 USD ($)	[2]	Mar. 31, 2018 USD ($)	[3]	Dec. 31, 2017 USD ($)		Sep. 30, 2017 USD ($)		Jun. 30, 2017 USD ($)	[6]	Mar. 31, 2017 USD ($)	[7]	Dec. 31, 2016 USD ($)		Sep. 30, 2018 USD ($) Party		Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Change in allowance for doubtful accounts
Allowance for doubtful accounts at beginning of period							$ 18.3								$ 21.2		$ 18.3		$ 21.2
Provision for doubtful accounts, net of recoveries																	(6.0)		0.8
Charge-off of accounts																	(2.2)		(4.2)
Foreign currency translation																	(0.2)		0.5
Allowance for doubtful accounts at end of period	$ 9.9								$ 18.3								9.9		18.3	$ 21.2
Gross income	$ 375.2	[1]	$ 402.9		$ 335.4		242.2	[4]	326.5	[5]	$ 386.9		$ 261.3		199.7	[8]	1,355.7		1,174.4	1,055.8
Interest Income (Expense), Net																	$ (55.6)	[9]	(54.9)	(58.3)
Credit Concentration Risk [Member] | Financing Receivable [Member]
Receivable aging and accrual status
Concentration of risk																	82.00%
Numbers of parties in receivable | Party	3																3
Credit Concentration Risk [Member] | Notes receivables
Receivable aging and accrual status
Concentration of risk																	98.00%
Numbers of parties in receivable | Party	1																1
Financing Receivable [Member]
Receivable aging and accrual status
Receivables on nonaccrual status	$ 10.2								3.7								$ 10.2		3.7
Receivables past due 90 days or more and still accruing	0.0								0.0								0.0		0.0
Receivables subject to general reserves	1.5								2.1								1.5		2.1
Allowance for doubtful accounts	0.0								0.0								0.0		0.0
Financing Receivable, Individually Evaluated for Impairment	10.2								3.7								10.2		3.7
Allowance for doubtful accounts	(2.8)								(1.5)								(2.8)		(1.5)
Change in allowance for doubtful accounts
Allowance for doubtful accounts at beginning of period							1.5								1.0		1.5		1.0
Provision for doubtful accounts, net of recoveries																	1.3		1.4
Charge-off of accounts																	0.0		(0.9)
Foreign currency translation																	0.0		0.0
Allowance for doubtful accounts at end of period	2.8								1.5								2.8		1.5	1.0
Notes receivables
Receivable aging and accrual status
Receivables on nonaccrual status	0.0								21.3								0.0		21.3
Receivables past due 90 days or more and still accruing	0.0								0.0								0.0		0.0
Receivables subject to general reserves	0.0								0.0								0.0		0.0
Allowance for doubtful accounts	0.0								0.0								0.0		0.0
Financing Receivable, Individually Evaluated for Impairment	1.4								34.2								1.4		34.2
Allowance for doubtful accounts	0.0								(10.0)								0.0		(10.0)
Change in allowance for doubtful accounts
Allowance for doubtful accounts at beginning of period							10.0								13.0		10.0		13.0
Provision for doubtful accounts, net of recoveries																	(8.2)		(1.3)
Charge-off of accounts																	(1.7)		(2.2)
Foreign currency translation																	(0.1)		0.5
Allowance for doubtful accounts at end of period	0.0								10.0								0.0		10.0	13.0
Trade and other receivables
Change in allowance for doubtful accounts
Allowance for doubtful accounts at beginning of period							$ 6.8								$ 7.2		6.8		7.2
Provision for doubtful accounts, net of recoveries																	0.9		0.7
Charge-off of accounts																	(0.5)		(1.1)
Foreign currency translation																	(0.1)		0.0
Allowance for doubtful accounts at end of period	$ 7.1								$ 6.8								7.1		$ 6.8	$ 7.2
Access Equipment Customer 1 [Member]
Change in allowance for doubtful accounts
Proceeds from Collection of Notes Receivable																	19.6
Gross income																	11.5
Collection of a receivable previously considered uncollectable																	2.4
Interest Income (Expense), Net																	$ 6.6

[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.

[9] Fiscal 2018 results include $9.9 million in debt extinguishment costs.