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Business Segment Information - Schedule of Net Sales by Geographical Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues $ 1,889.0 $ 1,796.7 $ 3,465.5 $ 3,491.8
North America        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 1,625.0 1,627.9 2,964.9 3,120.7
Europe, Africa and Middle East        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 159.6 103.3 302.5 184.3
Rest of the World        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 104.4 65.5 198.1 186.8
Intersegment Eliminations        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues (6.4) (6.3) [1] (13.5) (10.6) [1]
Intersegment Eliminations | North America        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues (6.4) (6.3) [1] (13.5) (10.6) [1]
Access Equipment        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 736.6 693.0 1,299.0 1,410.9
Access Equipment | Operating Segments        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 738.2 693.0 1,301.9 1,410.9
Access Equipment | Operating Segments | North America        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 555.4 553.9 960.7 1,101.0
Access Equipment | Operating Segments | Europe, Africa and Middle East        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 82.8 84.7 157.2 158.9
Access Equipment | Operating Segments | Rest of the World        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 100.0 54.4 184.0 151.0
Access Equipment | Intersegment Eliminations        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 1.6   2.9  
Defense        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 614.3 626.1 1,164.3 1,126.0
Defense | Operating Segments        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 614.7 631.0 1,165.0 1,131.4
Defense | Operating Segments | North America        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 551.2 612.0 [1] 1,045.4 1,104.8 [1]
Defense | Operating Segments | Europe, Africa and Middle East        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 63.0 17.7 [1] 118.3 23.8 [1]
Defense | Operating Segments | Rest of the World        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 0.5 1.3 [1] 1.3 2.8 [1]
Defense | Intersegment Eliminations        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 0.4 4.9 0.7 5.4
Fire & Emergency        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 308.7 241.9 578.5 494.6
Fire & Emergency | Operating Segments        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 312.5 242.3 586.4 499.2
Fire & Emergency | Operating Segments | North America        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 296.8 234.3 [1] 549.8 472.7 [1]
Fire & Emergency | Operating Segments | Europe, Africa and Middle East        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 13.3 0.3 [1] 26.3 0.7 [1]
Fire & Emergency | Operating Segments | Rest of the World        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 2.4 7.7 [1] 10.3 25.8 [1]
Fire & Emergency | Intersegment Eliminations        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 3.8 0.4 7.9 4.6
Commercial        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 228.8 235.0 423.0 458.9
Commercial | Operating Segments        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 230.0 236.7 425.7 460.9
Commercial | Operating Segments | North America        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 228.0 234.0 422.5 452.8
Commercial | Operating Segments | Europe, Africa and Middle East        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 0.5 0.6 0.7 0.9
Commercial | Operating Segments | Rest of the World        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues 1.5 2.1 2.5 7.2
Commercial | Intersegment Eliminations        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues $ 1.2 $ 1.7 $ 2.7 $ 2.0
[1] Results have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.