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Cash, Cash Equivalents and Short-Term Investments - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) investment investment_type | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) investment investment_type | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Investment Holdings [Line Items] |  |  |  |  |
Cash in transit for credit and debit card transactions | $ 13.2 |  | $ 13.2 |  | $ 11.5
Short-term investments, estimated fair value | $ 783.5 |  | $ 783.5 |  | 607.7
Number of investments in unrealized loss positions | investment | 52 |  | 52 |  |
Number of security types | investment_type | 8 |  | 8 |  |
Number of security types in loss position | investment_type | 2 |  | 2 |  |
Investment income | $ 2.7 | $ 5.6 | $ 7.8 | $ 11.8 |
Corporate notes and obligations |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Short-term investments, estimated fair value | 361.4 |  | 361.4 |  | 286.6
Unrealized losses, short term investments | 0.2 |  | 0.2 |  |
Asset-backed securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Short-term investments, estimated fair value | 83.6 |  | 83.6 |  | $ 53.8
Unrealized losses, short term investments | $ 0.1 |  | $ 0.1 |  |

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- Definition Amount due the Entity as a result of customers utilizing point of sale debit or credit cards in exchange transactions with the entity which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. + References No definition available. + Details
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