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Commitments and Contingencies - Narrative (Details) - Residential Mortgage - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]      
Valuation allowances and reserves, balance $ 1.0   $ 3.2
Accounting Standards Update 2016-13      
Loss Contingencies [Line Items]      
Valuation allowances and reserves, balance   $ (2.1)