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Financial Instruments - Fair Values of Financial Instruments Not Approximating Carrying Values in Financial Statements (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt and notes payable $ 1,201.7 $ 1,201.0
Carrying Value | Finance Receivables    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Finance receivables – net 1,843.4 1,733.0
Carrying Value | Contract Receivables    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Finance receivables – net 519.5 493.7
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt and notes payable 920.8 982.1
Fair Value | Finance Receivables    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Finance receivables – net 2,088.1 1,983.9
Fair Value | Contract Receivables    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Finance receivables – net $ 545.0 $ 520.4