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3. Fair Value Measurements Available-for-Sale Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | $ 1,300.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 1,320.6 |
Fair Value, Recurring [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale |  | 1,300.0 | $ 327.7
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 699.3 | 182.3
Fair Value, Recurring [Member] | Municipal Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 23.1 | 9.0
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 333.4 | 87.3
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 230.7 | 44.3
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 13.5 | 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
Short-term Investments [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 699.3 | 182.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (10.8) | (0.2)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.2 | 0.5
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 709.9 | 181.9
Short-term Investments [Member] | Fair Value, Recurring [Member] | Municipal Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 23.1 | 9.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (0.3) | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 23.4 | 9.0
Short-term Investments [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 333.4 | 87.4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (6.3) | (0.2)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.1 | 0.1
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 339.6 | 87.5
Short-term Investments [Member] | Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 230.7 | 44.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (3.2) | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 233.9 | 44.3
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 13.5 | 1.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (0.3) | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.0 | 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 13.8 | 1.0
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] |  | 3.8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] |  | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] |  | 0.0
Debt Securities, Available-for-sale, Amortized Cost | [1] |  | 3.8
Short-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 1,300.0 | 327.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (20.9) | (0.4)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] | 0.3 | 0.6
Debt Securities, Available-for-sale, Allowance for Credit Loss | [1] | 0.0 |
Debt Securities, Available-for-sale, Amortized Cost | [1] | $ 1,320.6 | $ 327.5
[1] | Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.

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