FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing liability: fixed-rate	$ 219.7	$ 220.6
Convertible senior note | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible senior note	476.4	476.4
Nonrecourse | Fixed-rate | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	639.8	657.3
Recourse | Fixed-rate | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	897.4	940.4
Recourse | Variable-rate | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	248.4	48.4
Level 3 | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing liability: fixed-rate	220.2	223.4
Level 3 | Nonrecourse | Fixed-rate | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	621.8	636.5
Level 3 | Recourse | Fixed-rate | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	883.6	920.4
Level 3 | Recourse | Variable-rate | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	252.9	48.5
Level 2 | Convertible senior note | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible senior note	$ 492.3	$ 471.2