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Revolving Credit Agreement Borrowings - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Line of Credit Facility [Line Items] |  |  |
Proceeds from revolving credit agreement borrowings |  | $ 234 | $ 0
2018 Revolver | Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ 250 | 250 |
Letters of credit outstanding | 16 | $ 16 |
Proceeds from revolving credit agreement borrowings | $ 234 |  |
2018 Revolver | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate |  | 1.625% |
2018 Revolver | Prime Rate | Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate |  | 0.625% |

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