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Derivative Financial Instruments - Zero-Cost Interest Rate Collar (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 4,629.2 $ 2,661.5 $ 1,467.7
Ending balance 5,210.4 4,629.2 2,661.5
Interest rate collar | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (2.6) (8.6) (1.0)
Amounts reclassified from AOCI to floorplan interest expense (2.0) 2.8 1.8
Loss recorded from interest rate collar 4.6 3.2 (9.4)
Ending balance 0.0 (2.6) (8.6)
Accrued Liabilities | Interest rate collar | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (1.9) (2.6) (0.1)
Amounts reclassified from AOCI to floorplan interest expense 0.7 2.8 1.8
Loss recorded from interest rate collar 1.2 (2.1) (4.3)
Ending balance 0.0 (1.9) (2.6)
Other Long-Term Liabilities | Interest rate collar | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (0.7) (6.0) (0.9)
Amounts reclassified from AOCI to floorplan interest expense 0.0 0.0 0.0
Loss recorded from interest rate collar 0.7 5.3 (5.1)
Ending balance 0.0 (0.7) (6.0)
Other Non-Current Assets | Interest rate collar | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 0.0 0.0 0.0
Amounts reclassified from AOCI to floorplan interest expense (2.7) 0.0 0.0
Loss recorded from interest rate collar 2.7 0.0 0.0
Ending balance $ 0.0 $ 0.0 $ 0.0