Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unpaid principal balance	$ 256.3	$ 232.7
Gain (loss) on sale of mortgage loans	$ (0.8)	(18.0)	$ 86.4
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short term borrowings maturity period	30 days
Fair Value, Inputs, Level 2 | Under Commitment to Sell
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, net	$ 105.1	142.9
Fair Value, Inputs, Level 2 | Not Under Commitment to Sell
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, net	$ 153.1	$ 86.6