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Loss Contingencies - Narrative (Details) - USD ($)
$ in Millions
Dec. 12, 2019
Jun. 21, 2019
Dec. 31, 2019
Bureau of the Fiscal Service      
Loss Contingencies [Line Items]      
Loss contingency, damages sought, value   $ 5.4  
Halbreiner Matter      
Loss Contingencies [Line Items]      
Payments for legal settlements $ 1.0    
United States Department of Education Matter      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss     $ 6.5
Legal reserve     1.0
Minimum | United States Department of Education Matter      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss     1.0
Maximum | United States Department of Education Matter      
Loss Contingencies [Line Items]      
Loss contingency, estimate of possible loss     $ 3.0