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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other current assets	Other current assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Liabilities, Current, Other long-term liabilities	Liabilities, Current, Other long-term liabilities
Senior Notes | 4.625% Senior notes due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt stated interest rate	4.625%
Senior Notes | 4.375% Senior notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt stated interest rate	4.375%
Senior Notes | 3.875% Senior notes due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt stated interest rate	3.875%
Fair Value, Recurring | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Shift Technologies, Inc.	$ 1.8	$ 40.9
Derivative Asset	22.1	6.4
Derivative liability	22.1	8.9
Fair Value, Recurring | Carrying Value | Senior Notes | 4.625% Senior notes due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	400.0	400.0
Fair Value, Recurring | Carrying Value | Senior Notes | 4.375% Senior notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	550.0	550.0
Fair Value, Recurring | Carrying Value | Senior Notes | 3.875% Senior notes due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	800.0	800.0
Fair Value, Recurring | Carrying Value | Notes Payable | Nonrecourse
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	422.2	317.6
Fair Value, Recurring | Carrying Value | Real estate mortgages and other debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	489.0	477.6
Fair Value, Recurring | Fair value measurement | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Shift Technologies, Inc.	1.8	40.4
Derivative Asset	0.0	0.0
Derivative liability	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 1 | Senior Notes | 4.625% Senior notes due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	364.0	420.0
Fair Value, Recurring | Fair value measurement | Level 1 | Senior Notes | 4.375% Senior notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	448.3	583.0
Fair Value, Recurring | Fair value measurement | Level 1 | Senior Notes | 3.875% Senior notes due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	656.0	815.0
Fair Value, Recurring | Fair value measurement | Level 1 | Notes Payable | Nonrecourse
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 1 | Real estate mortgages and other debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Shift Technologies, Inc.	0.0	0.5
Derivative Asset	22.1	6.4
Derivative liability	22.1	8.9
Fair Value, Recurring | Fair value measurement | Level 2 | Senior Notes | 4.625% Senior notes due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 2 | Senior Notes | 4.375% Senior notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 2 | Senior Notes | 3.875% Senior notes due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 2 | Notes Payable | Nonrecourse
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	411.8	316.8
Fair Value, Recurring | Fair value measurement | Level 2 | Real estate mortgages and other debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	399.0	488.7
Fair Value, Recurring | Fair value measurement | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Shift Technologies, Inc.	0.0	0.0
Derivative Asset	0.0	0.0
Derivative liability	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 3 | Senior Notes | 4.625% Senior notes due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 3 | Senior Notes | 4.375% Senior notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 3 | Senior Notes | 3.875% Senior notes due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 3 | Notes Payable | Nonrecourse
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0.0	0.0
Fair Value, Recurring | Fair value measurement | Level 3 | Real estate mortgages and other debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 0.0	$ 0.0

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