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Fair Value Measurements, Not Measured at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 162.5 $ 153.6
Debt 704.9 704.5
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 162.5 153.6
Long-term Debt, Fair Value 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0.0 0.0
Long-term Debt, Fair Value 709.9 711.2
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0.0 0.0
Long-term Debt, Fair Value 12.5 12.5
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 162.5 153.6
Long-term Debt, Fair Value 722.4 723.7
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt $ 704.9 $ 704.5