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2. Available-for-Sale Investments (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | $ 1,210.5 |
Debt Securities, Available-for-sale | [1] | 1,205.6 |
Fair Value, Recurring [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 1,205.6 | $ 327.7
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 576.7 | 182.3
Fair Value, Recurring [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 34.7 | 9.0
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 254.3 | 44.3
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 1.5 | 1.0
Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] |  | 3.8
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 330.4 | 87.3
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 1,210.5 | 327.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.3 | 0.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (5.2) | (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 1,205.6 | 327.7
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 579.1 | 181.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.2 | 0.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (2.6) | (0.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 576.7 | 182.2
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 34.8 | 9.0
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] | (0.1) | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 34.7 | 9.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 255.2 | 44.3
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] | (0.9) | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 254.3 | 44.3
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 1.5 | 1.0
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] | 1.5 | 1.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Debt [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] |  | 3.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] |  | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] |  | 0.0
Debt Securities, Available-for-sale | [1] |  | 3.8
Fair Value, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 331.9 | 87.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.1 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (1.6) | (0.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | $ 330.4 | $ 87.4
[1] | Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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