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Debt (Long-term Debt) (Details)
$ in Millions, ¥ in Billions
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Apr. 26, 2018
CNY (¥)
Debt Instrument [Line Items]      
Long-term Debt, gross $ 3,274.8 $ 3,773.6  
Less: Unamortized discount and debt issuance costs (12.2) (15.3)  
Less: Fair value hedge accounting adjustments 5.2 0.0  
Total Long-term Debt 3,267.8 3,758.3  
Less: Current portion of long-term debt [1],[2] (40.4) (406.6)  
Less: Long-term debt – related party (320.1) [2] (384.3) [2] ¥ (2.3)
Long-term Debt 2,907.3 2,967.4  
Debentures | Debenture 8.75% due 2021      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 18.4 18.4  
Interest rate, stated percentage 8.75%    
Medium-term Notes | Series E 7.6% due 2026      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 17.2 17.2  
Interest rate, weighted average 7.60%    
Senior Notes | Note 4.375% due 2019      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 0.0 400.0  
Interest rate, stated percentage 4.375%    
Senior Notes | Note 3.0% due 2022      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 400.0 400.0  
Interest rate, stated percentage 3.00%    
Senior Notes | Note 2.75% due 2023      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 400.0 400.0  
Interest rate, stated percentage 2.75%    
Senior Notes | Note 3.35% due 2024      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 400.0 400.0  
Interest rate, stated percentage 3.35%    
Bonds | Variable-rate industrial revenue bonds 1.44% due 2035 to 2050      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 631.9 631.9  
Interest rate, weighted average 1.44%    
Bonds | Other .25%      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 0.0 0.9  
Interest rate, weighted average 0.25%    
Bonds | Eurobonds 2.0% due 2020      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 327.0 348.1  
Interest rate, stated percentage 2.00%    
Bonds | Eurobonds .375% due 2021      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 381.5 406.2  
Interest rate, stated percentage 0.375%    
Bonds | Eurobonds 1.0% due 2025      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 327.0 348.1  
Interest rate, stated percentage 1.00%    
Bonds | Other Foreign 2.9% due 2020 to 2023      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 3.8 8.0  
Interest rate, stated percentage 2.90%    
Related Party | Chinese Renminbi 5.5% due 2020 to 2026      
Debt Instrument [Line Items]      
Long-term Debt, gross [3] $ 357.9 384.3  
Interest rate, stated percentage [3] 5.50%    
Capital Lease Obligations | Foreign 10.3% due 2020 to 2036      
Debt Instrument [Line Items]      
Long-term Debt, gross $ 10.1 $ 10.5  
Interest rate, stated percentage 10.30%    
[1]
Fiscal year 2019 includes the current portion of long-term debt owed to a related party of $37.8.
[2]
Refer to Note 7, Acquisitions, for additional information regarding related party debt.
[3]
Refer to Note 7, Acquisitions, for additional information regarding related party debt.