Variable Interest Entities - Information of Variable Interest Holdings (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entities
Assets	$ 518.7	$ 714.8
Unconsolidated VIE [Abstract]
Assets	518.7	714.8
Liabilities	540.3	732.4
Unconsolidated VIEs
Variable Interest Entities
Assets	728.1	795.5
Unconsolidated VIE [Abstract]
Assets	728.1	795.5
Liabilities	303.6	323.6
Equity interests on the Consolidated Balance Sheets	4.1	4.8
Maximum risk of loss	4.1	5.0
Consolidated VIEs
Variable Interest Entities
Assets	17.1	0.0
Unconsolidated VIE [Abstract]
Assets	17.1	0.0
Liabilities	$ 2.5	$ 0.0