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Business Segment Information - Schedule of Net Sales by Product Lines and Reportable Segments (Details) - USD ($)
$ in Millions

12 Months Ended

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2019

Segment Reporting Information [Line Items]

Revenues

$ 7,737.3

$ 6,856.8

$ 8,382.0

Access Equipment

Segment Reporting Information [Line Items]

Revenues

3,067.3

2,505.7

4,079.7

Access Equipment | Aerial Work Platforms

Segment Reporting Information [Line Items]

Revenues

1,471.4

1,101.7

1,944.4

Access Equipment | Telehandlers

Segment Reporting Information [Line Items]

Revenues

769.4

680.4

1,254.9

Access Equipment | Other

Segment Reporting Information [Line Items]

Revenues

826.5

723.6

880.4

Defense

Segment Reporting Information [Line Items]

Revenues

^[1]

2,524.1

2,300.4

2,085.7

Fire & Emergency

Segment Reporting Information [Line Items]

Revenues

^[1]

1,211.6

1,098.0

1,194.4

Commercial

Segment Reporting Information [Line Items]

Revenues

933.6

951.3

1,020.1

Commercial | Refuse Collection

Segment Reporting Information [Line Items]

Revenues

465.9

437.2

451.9

Commercial | Concrete

Segment Reporting Information [Line Items]

Revenues

364.8

403.5

439.9

Commercial | Other

Segment Reporting Information [Line Items]

Revenues

102.9

110.6

128.3

Corporate and Intersegment Eliminations

Segment Reporting Information [Line Items]

Revenues

^[1]

0.7

1.4

2.1

Operating Segments | Access Equipment

Segment Reporting Information [Line Items]

Revenues

3,072.1

2,515.1

4,079.7

Operating Segments | Access Equipment | Aerial Work Platforms

Segment Reporting Information [Line Items]

Revenues

1,471.4

1,101.7

1,944.4

Operating Segments | Access Equipment | Telehandlers

Segment Reporting Information [Line Items]

Revenues

769.4

680.4

1,254.9

Operating Segments | Access Equipment | Other

Segment Reporting Information [Line Items]

Revenues

831.3

733.0

880.4

Operating Segments | Defense

Segment Reporting Information [Line Items]

Revenues

^[1]

2,525.6

2,311.5

^[2]

2,097.5

^[2]

Operating Segments | Fire & Emergency

Segment Reporting Information [Line Items]

Revenues

^[1]

1,226.6

1,107.0

^[2]

1,210.7

^[2]

Operating Segments | Commercial

Segment Reporting Information [Line Items]

Revenues

937.6

957.8

1,022.2

Operating Segments | Commercial | Refuse Collection

Segment Reporting Information [Line Items]

Revenues

465.9

437.2

451.9

Operating Segments | Commercial | Concrete

Segment Reporting Information [Line Items]

Revenues

364.8

403.5

439.9

Operating Segments | Commercial | Other

Segment Reporting Information [Line Items]

Revenues

106.9

117.1

130.4

Corporate, Non-segment | Corporate and Intersegment Eliminations

Segment Reporting Information [Line Items]

Revenues

^[1]

(24.6)

(34.6)

(28.1)

Intersegment Eliminations

Segment Reporting Information [Line Items]

Revenues

(24.6)

(34.6)

^[1],[2]

(28.1)

^[1]

Intersegment Eliminations | Access Equipment

Segment Reporting Information [Line Items]

Revenues

4.8

9.4

Intersegment Eliminations | Access Equipment | Other

Segment Reporting Information [Line Items]

Revenues

4.8

9.4

Intersegment Eliminations | Defense

Segment Reporting Information [Line Items]

Revenues

^[1]

1.5

11.1

11.8

Intersegment Eliminations | Fire & Emergency

Segment Reporting Information [Line Items]

Revenues

^[1]

15.0

9.0

16.3

Intersegment Eliminations | Commercial

Segment Reporting Information [Line Items]

Revenues

4.0

6.5

2.1

Intersegment Eliminations | Commercial | Other

Segment Reporting Information [Line Items]

Revenues

4.0

6.5

2.1

Intersegment Eliminations | Corporate and Intersegment Eliminations

Segment Reporting Information [Line Items]

Revenues

^[1]

$ (25.3)

$ (36.0)

$ (30.2)

[1]	Results for fiscal 2020 and fiscal 2019 have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.
[2]	Results have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.

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