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2. Available-for-Sale Investments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | $ 356.5 |
Debt Securities, Available-for-sale | [1] | 359.9 |
Fair Value, Recurring [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 356.5 | $ 262.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 3.4 | 5.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 359.9 | 267.6
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 245.2 | 133.2
Fair Value, Recurring [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 17.9 | 15.2
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 58.5 | 76.9
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 3.2 | 4.0
Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 2.1 | 2.1
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 28.1 | 36.2
Fair Value, Recurring [Member] | Other Long-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 0.1 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 0.1 | 0.1
Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 0.1 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 0.1 | 0.1
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 356.4 | 262.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 3.4 | 5.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 359.8 | 267.5
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 243.3 | 130.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 1.9 | 2.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 245.2 | 133.2
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 17.8 | 15.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.1 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 17.9 | 15.2
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 57.3 | 74.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 1.2 | 2.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 58.5 | 76.9
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 3.2 | 4.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 3.2 | 4.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Debt [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 2.1 | 2.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 2.1 | 2.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 27.8 | 35.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.2 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 28.0 | 36.1
Fair Value, Recurring [Member] | Other Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | $ 0.1 | $ 0.1
[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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