Annual report pursuant to Section 13 and 15(d)

Investing Receivables (Narrative) (Details)

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Investing Receivables (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Investing receivables (net of allowance for credit losses of $2,794 and $1,599, respectively)  
Investing Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable, fair value disclosure $ 87.0 $ 84.0
Notes receivable from the City of Huntsville | LW Redstone Company, LLC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 9.95%  
Notes receivable, maximum initial maturity term 30 years  
Other investing loans receivable | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 8.00%  
Other investing loans receivable | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 14.00%  
Investing Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable, net of allowance for credit losses $ 2.9 $ 5.3
Investing Receivables | Other investing loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other investing loans receivable, remaining term 1 year