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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Funded loans unpaid principal	$ 42,100.0
Letters of credit outstanding	253.7
Accrued loan loss	60.7	$ 67.4
Assets available for recourse	622.9
Guarantees total	205.5
Recognized revenue included in contract liability	(131.8)
Contingent deferred consideration	$ 271.1	266.1
Maximum future commitments equity in real estate investment, percent	2.00%
Commitments to investment in future real estate investment	$ 175.7
Commitments to investment in future real estate investment	0.50
Commitment to investment in consolidated projects	$ 190.3
Commitments to investment in unconsolidated real estate subsidiary	54.3
Performance Guarantee
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	462.2	241.8
Other Current Liabilities
Loss Contingencies [Line Items]
Recognized revenue included in contract liability	265.0	264.1
Warehouse Receivable
Loss Contingencies [Line Items]
Warehouse receivables	226.5
Funded Loan Subject to Loss Sharing Arrangements
Loss Contingencies [Line Items]
Funded loans unpaid principal	38,700.0
Letters of credit outstanding	150.0	140.0
SBL Program
Loss Contingencies [Line Items]
Letters of credit outstanding	$ 5.0	$ 5.0
Percentage of maximum original principal amount loan loss	10.00%
Funded Loan Not Subject to Loss Sharing Arrangements
Loss Contingencies [Line Items]
Letters of credit outstanding	$ 155.0

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