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Loss Contingencies - Narrative (Details) - USD ($) $ in Millions | Oct. 01, 2019 | Jun. 21, 2019 | Sep. 30, 2019
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Bureau of the Fiscal Service |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency, damages sought, value |  | $ 5.4 |
Halbreiner Matter |  |  |
Loss Contingencies [Line Items] |  |  |
Legal reserve |  |  | $ 1.0
Halbreiner Matter | Subsequent Event |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation settlement, estimated amount | $ 1.0 |  |
United States Department of Education Matter |  |  |
Loss Contingencies [Line Items] |  |  |
Legal reserve |  |  | 1.0
Loss contingency, estimate of possible loss |  |  | 6.5
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

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