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Finance Receivable Sale Agreements - Narrative (Details) - USD ($)
12 Months Ended
May 07, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2019
Apr. 19, 2019
Nov. 02, 2018
Nov. 03, 2017
Nov. 02, 2017
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Beneficial interests in securitizations   $ 98,780,000 $ 0            
A&R Loan and Security Agreement | Revolving Credit Facility | SART 2017-1 Credit Facility | Ally Bank                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Line of credit facility, maximum borrowing capacity (up to) $ 350,000,000.0       $ 350,000,000.0        
Consumer Loan                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Payments to acquire certificate of the trust, net of cash acquired 34,000,000.0                
Beneficial interests in securitizations 139,700,000                
Certificate of the trust acquisition, debt and other liabilities assumed $ 105,700,000                
Purchase of finance receivables   127,700,000              
Consumer Loan | MPSA                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Transfer of financial assets, accounted for as sales, maximum amount eligible to be sold       $ 375,000,000.0       $ 1,500,000,000 $ 375,000,000.0
Commitment of purchaser, current availability financing, principal balances of finance receivables (up to)           $ 1,000,000,000.0 $ 1,250,000,000    
Transfer of financial assets accounted for as sales, amount derecognized   418,800,000 733,400,000            
Receivable purchase agreement, remaining unused capacity   658,300,000              
Consumer Loan | 2016 Master Transfer Agreement                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Transfer of financial assets, accounted for as sales, maximum amount eligible to be sold       292,200,000          
Consumer Loan | 2017 Master Transfer Agreement                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Transfer of financial assets, accounted for as sales, maximum amount eligible to be sold               $ 357,100,000  
Transfer of financial assets accounted for as sales, amount derecognized   139,300,000 348,800,000            
Purchase of finance receivables     387,400,000            
Transfer of financial assets accounted for as sales, transaction fee received     6,300,000            
Consumer Loan | 2018 Master Transfer Agreement                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Transfer of financial assets accounted for as sales, amount derecognized     115,000,000.0            
Consumer Loan | Master Purchase and Sale Agreement and Master Transfer Agreements                  
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                  
Gain on loan sales   $ 137,300,000 $ 51,700,000 $ 21,700,000