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Derivative Financial Instruments - Liabilities Related to Zero-Cost Interest Rate Collar (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Beginning Balance $ 4,228.4   $ 2,661.5 $ 1,694.4 $ 1,532.2   $ 1,467.7
Ending Balance 4,544.6 $ 4,228.4   2,661.5 1,694.4 $ 1,532.2  
Interest Rate Contract | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Beginning Balance (5.9) (6.1) (8.6) (9.2) (9.8) (7.9) (1.0)
Amounts reclassified from AOCI to floorplan interest expense 0.7 0.7 0.7 0.7 0.7 0.4  
(Loss) gain recorded from interest rate collar 0.0 (0.5) 1.8 (0.1) (0.1) (2.3) (6.9)
Ending Balance (5.2) (5.9) (6.1) (8.6) (9.2) (9.8) (7.9)
Interest Rate Contract | Accrued Liabilities | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Beginning Balance (2.5) (2.5) (2.6) (2.5) (2.5) (1.9) (0.1)
Amounts reclassified from AOCI to floorplan interest expense 0.7 0.7 0.7 0.7 0.7 0.4  
(Loss) gain recorded from interest rate collar (0.7) (0.7) (0.6) (0.8) (0.7) (1.0) (1.8)
Ending Balance (2.5) (2.5) (2.5) (2.6) (2.5) (2.5) (1.9)
Interest Rate Contract | Other Long-Term Liabilities | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest              
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]              
Beginning Balance (3.4) (3.6) (6.0) (6.7) (7.3) (6.0) (0.9)
Amounts reclassified from AOCI to floorplan interest expense 0.0 0.0 0.0 0.0 0.0 0.0  
(Loss) gain recorded from interest rate collar 0.7 0.2 2.4 0.7 0.6 (1.3) (5.1)
Ending Balance $ (2.7) $ (3.4) $ (3.6) $ (6.0) $ (6.7) $ (7.3) $ (6.0)