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Debt (Summary of Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Mar. 30, 2015
Debt Instrument [Line Items]          
Balance outstanding $ 38.4 $ 171.9      
Secured Debt 3,233.0 3,092.7      
Balance outstanding 939.6 544.4      
Restricted cash and cash equivalents pledged as collateral 328.8 303.6 $ 338.0 $ 255.6  
Mortgage note [1] 11.6 11.9      
Revolving Secured Line of Credit [Member]          
Debt Instrument [Line Items]          
Balance outstanding 38.4 171.9      
Amount available for borrowing [2] $ 301.6 $ 178.1      
Interest rate 4.27% 4.38%      
Warehouse Facility II [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 201.0 $ 0.0      
Amount available for borrowing [2] 199.0 400.0      
Loans pledged as collateral 293.0 0.0      
Restricted cash and cash equivalents pledged as collateral $ 4.6 $ 1.0      
Interest rate 4.19% 0.00%      
Warehouse Facility IV [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [2] 250.0 250.0      
Loans pledged as collateral 0.0 0.0      
Restricted cash and cash equivalents pledged as collateral $ 1.0 $ 1.0      
Interest rate 0.00% 0.00%      
Warehouse Facility V [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [2] 100.0 100.0      
Loans pledged as collateral 0.0 0.0      
Restricted cash and cash equivalents pledged as collateral $ 1.0 $ 1.0      
Interest rate 0.00% 0.00%      
Warehouse Facility VI [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [2] 75.0 75.0      
Loans pledged as collateral 0.0        
Restricted cash and cash equivalents pledged as collateral $ 0.0 $ 0.1      
Interest rate 0.00% 0.00%      
Warehouse Facility VII [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 25.0 $ 0.0      
Amount available for borrowing [2] 125.0 150.0      
Loans pledged as collateral 30.9 0.0      
Restricted cash and cash equivalents pledged as collateral $ 1.5 $ 1.0      
Interest rate 4.65% 0.00%      
Term ABS 2016-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 125.3      
Loans pledged as collateral 0.0 320.8      
Restricted cash and cash equivalents pledged as collateral $ 0.0 $ 29.6      
Interest rate 0.00% 4.41%      
Term ABS 2016-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 61.6 $ 184.5      
Loans pledged as collateral 259.0 335.0      
Restricted cash and cash equivalents pledged as collateral $ 26.8 $ 28.3      
Interest rate 4.06% 3.20%      
Term ABS 2016-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 161.1 $ 300.6      
Loans pledged as collateral 294.7 392.7      
Restricted cash and cash equivalents pledged as collateral $ 28.8 $ 30.7      
Interest rate 2.97% 2.59%      
Term ABS 2017-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 247.1 $ 350.0      
Loans pledged as collateral 371.4 429.8      
Restricted cash and cash equivalents pledged as collateral $ 31.7 $ 30.9      
Interest rate 2.87% 2.78%      
Term ABS 2017-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 450.0 $ 450.0      
Loans pledged as collateral 544.8 548.4      
Restricted cash and cash equivalents pledged as collateral $ 42.9 $ 39.4      
Interest rate 2.72% 2.72%      
Term ABS 2017-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 350.0 $ 350.0      
Loans pledged as collateral 423.1 426.1      
Restricted cash and cash equivalents pledged as collateral $ 32.6 $ 28.6      
Interest rate 2.88% 2.88%      
Term ABS 2018-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 500.0 $ 500.0      
Loans pledged as collateral 609.5 614.5      
Restricted cash and cash equivalents pledged as collateral $ 45.8 $ 41.8      
Interest rate 3.24% 3.24%      
Term ABS 2018-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 450.0 $ 450.0      
Loans pledged as collateral 549.0 552.2      
Restricted cash and cash equivalents pledged as collateral $ 40.9 $ 36.3      
Interest rate 3.68% 3.68%      
Term ABS 2018-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 398.3 $ 398.3      
Loans pledged as collateral 535.9 578.8      
Restricted cash and cash equivalents pledged as collateral $ 36.4 $ 33.6      
Interest rate 3.72% 3.72%      
Term ABS 2019-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 402.5        
Loans pledged as collateral 514.2        
Restricted cash and cash equivalents pledged as collateral $ 34.1        
Interest rate 3.53%        
2021 Senior Notes [Member]          
Debt Instrument [Line Items]          
Balance outstanding $ 300.0 $ 300.0      
Interest rate 6.125% 6.125%      
2023 Senior Notes [Member]          
Debt Instrument [Line Items]          
Balance outstanding $ 250.0 $ 250.0      
Interest rate 7.375% 7.375%     7.50%
Mortgages [Member]          
Debt Instrument [Line Items]          
Interest rate 3.94% 3.85%      
Mortgage note $ 11.6 $ 11.9      
[1]
Measured at amortized cost with fair value disclosed.
[2]
Availability may be limited by the amount of assets pledged as collateral.