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2. Available-for-Sale Investments (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | $ 1,344.1 |
Debt Securities, Available-for-sale | [1] | 1,327.6 |
Fair Value, Recurring [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 1,327.6 | $ 1,300.0
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 1,344.1 | 1,320.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.9 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (17.4) | (20.9)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 1,327.6 | 1,300.0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 674.2 | 699.3
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 682.8 | 709.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.4 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (9.0) | (10.8)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 674.2 | 699.3
Fair Value, Recurring [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 18.0 | 23.1
Fair Value, Recurring [Member] | Municipal obligations [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 18.2 | 23.4
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] | (0.2) | (0.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 18.0 | 23.1
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 293.7 | 230.7
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 295.9 | 233.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.2 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (2.4) | (3.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 293.7 | 230.7
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 13.6 | 13.5
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 13.8 | 13.8
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] | (0.2) | (0.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | 13.6 | 13.5
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 328.1 | 333.4
Fair Value, Recurring [Member] | Asset-backed Securities [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 333.4 | 339.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.3 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | [1] | (5.6) | (6.3)
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale | [1] | $ 328.1 | $ 333.4
[1] | Available-for-sale investments are included in Short-term investments in the condensed consolidatedbalance sheets.

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