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Debt (Summary of Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 30, 2015
Debt Instrument [Line Items]          
Balance outstanding $ 23.0 $ 13.9      
Secured Debt 2,880.2 2,514.1      
Balance outstanding 543.2 542.8      
Restricted cash and cash equivalents pledged as collateral 368.5 255.6 $ 316.7 $ 224.7  
Revolving Secured Line of Credit [Member]          
Debt Instrument [Line Items]          
Balance outstanding 23.0 13.9      
Amount available for borrowing [1] $ 327.0 $ 336.1      
Interest rate 4.72% 3.44%      
Warehouse Facility II [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [1] 400.0 400.0      
Loans pledged as collateral 0.0 0.0      
Restricted cash and cash equivalents pledged as collateral $ 1.4 $ 1.0      
Senior notes yield to maturity 0.00% 0.00%      
Warehouse Facility IV [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [1] 100.0 100.0      
Loans pledged as collateral 0.0 0.0      
Restricted cash and cash equivalents pledged as collateral $ 1.2 $ 1.0      
Senior notes yield to maturity 0.00% 0.00%      
Warehouse Facility V [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [1] 100.0 100.0      
Loans pledged as collateral 0.0 0.0      
Restricted cash and cash equivalents pledged as collateral $ 1.2 $ 1.0      
Senior notes yield to maturity 0.00% 0.00%      
Warehouse Facility VI [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0 $ 0.0      
Amount available for borrowing [1] 75.0 75.0      
Loans pledged as collateral 0.0        
Restricted cash and cash equivalents pledged as collateral $ 0.1 $ 0.0      
Senior notes yield to maturity 0.00% 0.00%      
Warehouse Facility VII [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 0.0        
Amount available for borrowing [1] 150.0 $ 150.0      
Loans pledged as collateral 0.0        
Restricted cash and cash equivalents pledged as collateral $ 1.1 $ 1.0      
Senior notes yield to maturity 0.00% 0.00%      
Term ABS 2015-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 32.2 $ 78.0      
Loans pledged as collateral 208.1 238.4      
Restricted cash and cash equivalents pledged as collateral $ 26.2 $ 23.3      
Senior notes yield to maturity 3.27% 2.88%      
Term ABS 2015-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 159.3 $ 215.9      
Loans pledged as collateral 275.3 313.3      
Restricted cash and cash equivalents pledged as collateral $ 31.3 $ 26.4      
Senior notes yield to maturity 2.83% 2.72%      
Term ABS 2016-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 355.2 $ 385.0      
Loans pledged as collateral 460.0 467.2      
Restricted cash and cash equivalents pledged as collateral $ 44.9 $ 36.6      
Senior notes yield to maturity 3.73% 3.18%      
Term ABS 2016-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 350.2 $ 350.2      
Loans pledged as collateral 429.7 428.0      
Restricted cash and cash equivalents pledged as collateral $ 40.8 $ 33.2      
Senior notes yield to maturity 2.83% 2.83%      
Term ABS 2016-3 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 350.0 $ 350.0      
Loans pledged as collateral 418.5 425.7      
Restricted cash and cash equivalents pledged as collateral $ 40.2 $ 31.1      
Senior notes yield to maturity 2.53% 2.53%      
Term ABS 2017-1 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 350.0 $ 350.0      
Loans pledged as collateral 426.0 425.9      
Restricted cash and cash equivalents pledged as collateral $ 39.3 $ 30.8      
Senior notes yield to maturity 2.78% 2.78%      
Term ABS 2017-2 [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 450.0 $ 450.0      
Loans pledged as collateral 550.2 545.8      
Restricted cash and cash equivalents pledged as collateral $ 50.8 $ 39.8      
Senior notes yield to maturity 2.72% 2.72%      
TermAssetBackedSecuredFinancingsTwoThousandSeventeenThree [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 350.0 $ 350.0      
Loans pledged as collateral 473.6 482.6      
Restricted cash and cash equivalents pledged as collateral $ 38.4 $ 29.6      
Senior notes yield to maturity 2.88% 0.00%      
TermAssetBackedSecuredFinancingsTwoThousandEighteenOne [Member]          
Debt Instrument [Line Items]          
Secured Debt $ 500.0        
Loans pledged as collateral 629.5        
Restricted cash and cash equivalents pledged as collateral $ 50.1        
Senior notes yield to maturity 3.24%        
2021 Senior Notes [Member]          
Debt Instrument [Line Items]          
Balance outstanding $ 300.0 $ 300.0      
Senior notes yield to maturity 6.125% 6.125%      
2023 Senior Notes [Member]          
Debt Instrument [Line Items]          
Balance outstanding $ 250.0 $ 250.0      
Senior notes yield to maturity 7.375% 7.375%     7.50%
[1] Availability may be limited by the amount of assets pledged as collateral.