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Debt and Financing Arrangements (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2020
Apr. 20, 2020
USD ($)
May 06, 2019
USD ($)
Mar. 31, 2021
Sep. 30, 2020
USD ($)
Jun. 30, 2020
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2020
EUR (€)
Debt Instrument [Line Items]                    
ABL credit facility springing maturity period             91 days      
Gain on partial extinguishment of debt             $ 3,000,000 $ 0 $ 0  
Deferred finance fee charges               13,000,000    
Total interest paid             203,000,000 137,000,000 $ 143,000,000  
Revolving credit facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         $ 1,250,000,000   1,250,000,000      
Credit facility expansion             250,000,000      
Remaining borrowing capacity         787,000,000   787,000,000      
Letters of credit outstanding, amount         138,000,000   $ 138,000,000      
Revolving credit facility | Minimum                    
Debt Instrument [Line Items]                    
Commitment fee on unused portion of commitments (as percent)             0.25%      
Revolving credit facility | Maximum                    
Debt Instrument [Line Items]                    
Commitment fee on unused portion of commitments (as percent)             0.375%      
Revolving credit facility | EURIBOR | Minimum                    
Debt Instrument [Line Items]                    
Basis spread (as percent)             1.50%      
Revolving credit facility | EURIBOR | Maximum                    
Debt Instrument [Line Items]                    
Basis spread (as percent)             2.00%      
Revolving credit facility | North American                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         950,000,000   $ 950,000,000      
Revolving credit facility | European                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         300,000,000   300,000,000      
Letter of credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         $ 150,000,000   $ 150,000,000      
Term Loan B - LIBOR plus 4.00% due in 2024 | Maximum                    
Debt Instrument [Line Items]                    
First lien secured net leverage ratio     1.75              
Term Loan B - LIBOR plus 4.00% due in 2024 | Term loan                    
Debt Instrument [Line Items]                    
Basis spread (as percent)     4.25%              
Debt instrument, term     5 years              
Face amount of debt     $ 800,000,000              
Debt instrument period percentage     1.00%              
Debt instrument step down rate     0.25%              
Incremental term loan | Term loan                    
Debt Instrument [Line Items]                    
Face amount of debt     $ 750,000,000              
7.00% Notes due in 2026 | Senior Notes                    
Debt Instrument [Line Items]                    
Face amount of debt     $ 800,000,000              
Interest rate (as percent)     7.00%              
7.00% Notes due in 2026 | Unsecured debt                    
Debt Instrument [Line Items]                    
Interest rate (as percent)         7.00%   7.00%     7.00%
Long-term debt, gross         $ 800,000,000   $ 800,000,000 800,000,000    
4.875% Notes due in 2026 | Unsecured debt                    
Debt Instrument [Line Items]                    
Face amount of debt         $ 900,000,000   $ 900,000,000      
Interest rate (as percent)         4.875%   4.875%     4.875%
Repayments of unsecured debt         $ 103,000,000          
Long-term debt, gross         797,000,000   $ 797,000,000 900,000,000    
Gain on partial extinguishment of debt         $ 3,000,000          
3.50% Notes due in 2024 | Senior Notes                    
Debt Instrument [Line Items]                    
Interest rate (as percent)   3.50%                
3.50% Notes due in 2024 | Unsecured debt                    
Debt Instrument [Line Items]                    
Face amount of debt | €                   € 1,000,000,000.0
Interest rate (as percent)         3.50%   3.50%     3.50%
Long-term debt, gross         $ 1,173,000,000   $ 1,173,000,000 1,094,000,000    
European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | EURIBOR                    
Debt Instrument [Line Items]                    
Basis spread (as percent)             1.58%      
European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | Unsecured debt                    
Debt Instrument [Line Items]                    
Face amount of debt | €                   € 165,000,000
Long-term debt, gross         $ 0   $ 0 $ 180,000,000    
Net leverage to EBITDA multiple 6.75       5.25 5.25        
European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | Unsecured debt | Forecast                    
Debt Instrument [Line Items]                    
Net leverage to EBITDA multiple       4.50            
European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | Unsecured debt | EURIBOR                    
Debt Instrument [Line Items]                    
Basis spread (as percent)             1.58%      
Senior notes due 2025, 9.00% | Senior Notes                    
Debt Instrument [Line Items]                    
Face amount of debt   $ 600,000,000                
Interest rate (as percent)   9.00%                
Proceeds from debt, net of issuance costs   $ 591,000,000                
Debt issuance costs, gross   $ 10,000,000