Quarterly report pursuant to Section 13 or 15(d)

Investing Receivables - Narrative (Details)

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Investing Receivables - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Investing Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable, fair value disclosure $ 78.0 $ 74.0
Investing Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable, net of allowance for credit losses $ 3.4 $ 4.7
Investing Receivables | Other investing loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 8.00%  
Investing Receivables | LW Redstone Company, LLC | Notes receivable from the City of Huntsville    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate 9.95%