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Acquisitions and Divestitures (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2023
USD ($)
Apr. 30, 2023
USD ($)
Apr. 30, 2023
CNY (¥)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
CNY (¥)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
CNY (¥)
Dec. 31, 2023
USD ($)
Nov. 30, 2023
CNY (¥)
Oct. 31, 2023
Business Acquisition [Line Items]                    
Goodwill       $ 2,094.0       $ 2,138.0    
YFAT                    
Business Acquisition [Line Items]                    
Business combination, deposit to acquire interest in joint venture       11.0 ¥ 75 $ 12.0 ¥ 75      
Percent of total consideration           50.00% 50.00%      
Goodwill   $ 13.0                
Acquisition of businesses, net of cash acquired   5.0                
KEIPER | YFAT                    
Business Acquisition [Line Items]                    
Net purchase consideration   $ 23.0 ¥ 150              
Asia                    
Business Acquisition [Line Items]                    
Goodwill       $ 1,168.0       $ 1,192.0    
Assets Held For Sale | Adient (Langfang) Seating Co., Ltd                    
Business Acquisition [Line Items]                    
Subsidiary, ownership percentage disposed                   100.00%
Disposed of By Sale | Adient (Langfang) Seating Co., Ltd                    
Business Acquisition [Line Items]                    
Subsidiary, ownership percentage disposed 51.00%               51.00%  
Consideration for disposal group $ 6.0               ¥ 44  
Deconsolidated cash 9.0                  
Loss on disposal 8.0                  
Disposed of By Sale | Adient (Langfang) Seating Co., Ltd | Asia                    
Business Acquisition [Line Items]                    
Goodwill $ 5.0