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Debt (Details) - USD ($)
3 Months Ended
Feb. 08, 2019
Mar. 31, 2019
Feb. 07, 2019
Feb. 06, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Debt outstanding on facilities with fixed interest rates   $ 4,484,600,000      
Debt Instrument Interest Rate During Period Fixed Rate Debt   4.26%      
Long Term Debt, Percentage Bearing Fixed Interest Rate Remaining Term   3 years 9 months 26 days      
Debt outstanding on facilities with interest rates based on floating rate indices   $ 2,943,100,000      
Debt Instrument Interest Rate During Period Variable Rate Debt   4.22%      
Long Term Debt, Percentage Bearing Variable Interest Rate Remaining Term   3 years 6 months 12 days      
Percentage of Debt Hedged by Interest Rate Derivatives   84.00%      
Debt Instrument Interest Rate During Period Fixed Rate and Interest Swap Rate Debt   4.17%      
Hedged Portion of Debt Average Remaining Maturity   4 years 6 days      
Debt Instrument, Interest Rate During Period   4.18%      
Debt termination expense   $ 0      
Institutional Notes [Domain]          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations   $ 2,167,257,000     $ 2,198,200,000
Debt Instrument, Interest Rate, Effective Percentage   4.73%      
Asset-backed securitization term notes          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations   $ 2,967,601,000     3,063,821,000
Debt Instrument, Interest Rate, Effective Percentage   3.95%      
Term Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   4.06%      
Asset Backed Warehouse Facility [Member]          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations   $ 350,000,000     340,000,000
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   81.00%      
Debt Instrument, Interest Rate, Effective Percentage   4.24%      
Maximum borrowing capacity   $ 1,200,000,000.0      
Line of Credit Facility, Remaining Borrowing Capacity   400,000,000      
Revolving credit facilities          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations   $ 365,000,000     375,000,000
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   83.00%      
Debt Instrument, Interest Rate, Effective Percentage   4.49%      
Maximum borrowing capacity   $ 1,235,000,000 $ 300,000,000 $ 800,000,000  
Capital lease obligations          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations   73,399,000     $ 75,526,000
Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Net notional amount   $ 1,753,300,000      
Net Notional Amount of Interest Rate During Period   2.24%      
Weighted Average Remaining Term   4 years 5 months 7 days      
Minimum [Member]          
Debt Instrument [Line Items]          
Capital Lease Period Over Which Interest Expense Recognized Preceding Early Purchase Option   3 years      
Minimum [Member] | Institutional Notes [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Term   7 years      
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   83.00%      
Minimum [Member] | Asset-backed securitization term notes          
Debt Instrument [Line Items]          
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   77.00%      
Minimum [Member] | Term Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   79.00%      
Minimum [Member] | Asset Backed Warehouse Facility [Member]          
Debt Instrument [Line Items]          
Bank Account Maintenance Required Amount Balance, Interest Expense   3 months      
Minimum [Member] | Capital lease obligations          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   3.60%      
Maximum [Member]          
Debt Instrument [Line Items]          
Capital Lease Period Over Which Interest Expense Recognized Preceding Early Purchase Option   10 years      
Maximum [Member] | Institutional Notes [Domain]          
Debt Instrument [Line Items]          
Debt Instrument, Term   12 years      
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   85.00%      
Maximum [Member] | Asset-backed securitization term notes          
Debt Instrument [Line Items]          
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   87.00%      
Maximum [Member] | Term Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Advance Rate Used in Calculating Borrowing Capacity   83.00%      
Maximum [Member] | Capital lease obligations          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Effective Percentage   4.93%      
London Interbank Offered Rate (LIBOR) [Member] | Asset Backed Warehouse Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 1.75%        
Pre-Conversion [Member] | London Interbank Offered Rate (LIBOR) [Member] | Asset Backed Warehouse Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.85% 1.85%      
Post-Conversion [Member] | London Interbank Offered Rate (LIBOR) [Member] | Asset Backed Warehouse Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.85%      
Interest Rate Swap [Member]          
Debt Instrument [Line Items]          
Debt Instrument Interest Rate During Period Variable Rate Debt   4.06%      
Debt and Capital Lease Obligations   $ 6,237,900,000