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2. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions | Jun. 30, 2021 USD ($) | [1]
--- | --- | ---
Fair Value Disclosures [Abstract] |
Mature in less than one year | $ 257.0
Mature in one to five years | 64.0
Mature in more than five years | 35.5
Total Amortized Cost | 356.5
Mature in less than one year | 257.4
Mature in one to five years | 65.7
Mature in more than five years | 36.8
Estimated Fair Value | $ 359.9
[1] | Available-for-sale investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
| June 30, 2021 |  | December 31, 2020
Short-term investments | $ | 359.8 |  |  | $ | 267.5 |
Other investments | 0.1 |  |  | 0.1 |
Total | $ | 359.9 |  |  | $ | 267.6 |

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