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Basis of Presentation and Major Accounting Policies (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2022
USD ($)
segment
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Accounting Policies [Abstract]        
Number of reportable segments | segment   5    
Assets of discontinued operations   $ 0 $ 0  
Liabilities of discontinued operations   0 0  
Environmental expenditures   22,300,000 18,600,000 $ 18,300,000
Pre-tax loss from discontinued operations $ 19,000,000.0     19,000,000.0
Capitalized interest   41,000,000.0 28,300,000 15,900,000
Asset retirement obligations   274,700,000 269,600,000 241,400,000
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, residual value   0    
Income (loss) from discontinued operations, net of tax   $ 12,600,000 $ 70,300,000 $ (14,300,000)
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]   Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Other Non-Operating Income (Expense), Net        
Accounting Policies [Abstract]        
Excluded components recognized within earnings   $ 23,200,000 $ 31,000,000.0 $ 33,500,000
Finite-Lived Intangible Assets [Line Items]        
Excluded components recognized within earnings   23,200,000 $ 31,000,000.0 $ 33,500,000
UKRAINE        
Property, Plant and Equipment [Line Items]        
Suspended asset under construction   $ 45,000,000    
Computer software costs | Minimum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life   3 years    
Computer software costs | Maximum        
Property, Plant and Equipment [Line Items]        
Property and equipment, useful life   5 years    
Customer relationships | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life   5 years    
Customer relationships | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life   25 years    
Patents and technology | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life   5 years    
Patents and technology | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life   15 years    
Land Use Rights        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, useful life   50 years