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Commitments and Contingencies (Details)
$ in Millions
Jun. 30, 2020
USD ($)
item
Property, Plant and Equipment [Line Items]  
Number of guarantees | item 6
Infrastructure Lending Segment  
Property, Plant and Equipment [Line Items]  
Outstanding $ 24.9
Commitments | Commercial and Residential Lending Segment  
Property, Plant and Equipment [Line Items]  
Value of loans with future funding commitments 2,000.0
Value of loans with future funding commitments expected to fund 1,900.0
Commitments | Infrastructure Lending Segment  
Property, Plant and Equipment [Line Items]  
Value of loans with future funding commitments 272.7
Revolvers and letters of credit | Infrastructure Lending Segment  
Property, Plant and Equipment [Line Items]  
Value of loans with future funding commitments 139.8
Delayed draw term loans | Infrastructure Lending Segment  
Property, Plant and Equipment [Line Items]  
Value of loans with future funding commitments 132.9
RMBS  
Property, Plant and Equipment [Line Items]  
Outstanding residential mortgage loan purchase commitment $ 557.9