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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table sets forth intangible assets by class:
March 31, 2024September 30, 2023
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Accumulated
Amortization		Net
Indefinite lived
Trade names and brands$594.6 $— $594.6 $592.9 $— $592.9 
Amortizable
Trade names and brands$339.6 $96.1 $243.5 $339.6 $88.1 $251.5 
Technology and patents79.6 76.7 2.9 79.4 76.2 3.2 
Customer related and other271.0 151.6 119.4 269.8 143.6 126.2 
Amortizable intangible assets690.2 324.4 365.8 688.8 307.9 380.9 
Total intangible assets$1,284.8 $324.4 $960.4 $1,281.7 $307.9 $973.8 
Schedule of Amortizable Intangible Assets
The following table sets forth intangible assets by class:
March 31, 2024September 30, 2023
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Accumulated
Amortization		Net
Indefinite lived
Trade names and brands$594.6 $— $594.6 $592.9 $— $592.9 
Amortizable
Trade names and brands$339.6 $96.1 $243.5 $339.6 $88.1 $251.5 
Technology and patents79.6 76.7 2.9 79.4 76.2 3.2 
Customer related and other271.0 151.6 119.4 269.8 143.6 126.2 
Amortizable intangible assets690.2 324.4 365.8 688.8 307.9 380.9 
Total intangible assets$1,284.8 $324.4 $960.4 $1,281.7 $307.9 $973.8 

Amortization expense was $7.8 and $15.6 for the three and six months ended March 31, 2024, respectively, and $7.7 and $15.4 for the three and six months ended March 31, 2023, respectively. Estimated amortization expense for amortizable intangible assets is as follows:
Estimated amortization expense
Remainder of fiscal year 2024$15.5 
202531.1 
202630.7 
202730.5 
202830.4 
202930.4 
Thereafter197.2