Variable Interest Entities - Information of Variable Interest Holdings (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entities
Unconsolidated VIE assets	$ 546.0	$ 518.7
Unconsolidated VIE liabilities	554.3	540.3
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Unconsolidated VIE assets	742.5	728.1
Unconsolidated VIE liabilities	310.6	303.6
Equity interests on the Condensed Consolidated Balance Sheets	4.2	4.1
Maximum risk of loss	$ 4.2	$ 4.1