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Investments Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Document Period End Date   Sep. 30, 2018    
Financing Receivable, Significant Sales $ 4.5 $ 4.5    
Finance lease receivables 14.9 14.9 $ 14.4  
Finance Leases Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance leases and notes receivable individually evaluated for impairment 30.5 30.5   $ 32.4
Notes Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance leases and notes receivable individually evaluated for impairment $ 10.8 $ 10.8   $ 21.0