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Marketable Securities and Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Fair Value, Nonrecurring | Pfizer, Inc. | Stock Purchase Agreement |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Non-recurring fair value measurements |  |  | $ 264.6
Level 2 | Fair Value, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | $ 1,143.2 | $ 1,398.9 |
Gross Unrealized Gains | 0.0 | 0.0 |
Gross Unrealized Losses | (19.2) | (4.6) |
Fair Value | 1,124.0 | 1,394.3 |
Level 2 | Fair Value, Recurring | Corporate Bonds Maturing 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | 802.7 |  |
Gross Unrealized Gains | 0.0 |  |
Gross Unrealized Losses | (9.3) |  |
Fair Value | 793.4 |  |
Level 2 | Fair Value, Recurring | Corporate Bonds Maturing 2024-2025 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | 205.3 |  |
Gross Unrealized Gains | 0.0 |  |
Gross Unrealized Losses | (9.2) |  |
Fair Value | 196.1 |  |
Level 2 | Fair Value, Recurring | Government Securities Maturing 2023 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | 61.9 |  |
Gross Unrealized Gains | 0.0 |  |
Gross Unrealized Losses | (0.4) |  |
Fair Value | 61.5 |  |
Level 2 | Fair Value, Recurring | Government Securities Maturing 2024 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost | 73.3 |  |
Gross Unrealized Gains | 0.0 |  |
Gross Unrealized Losses | (0.3) |  |
Fair Value | $ 73.0 |  |
Level 2 | Fair Value, Recurring | Corporate Bonds Maturing 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost |  | 784.0 |
Gross Unrealized Gains |  | 0.0 |
Gross Unrealized Losses |  | (0.7) |
Fair Value |  | 783.3 |
Level 2 | Fair Value, Recurring | Corporate Bonds Maturing 2023 -2024 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost |  | 582.5 |
Gross Unrealized Gains |  | 0.0 |
Gross Unrealized Losses |  | (3.8) |
Fair Value |  | 578.7 |
Level 2 | Fair Value, Recurring | Government Securities Maturing 2022 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amortized Cost |  | 32.4 |
Gross Unrealized Gains |  | 0.0 |
Gross Unrealized Losses |  | (0.1) |
Fair Value |  | $ 32.3 |

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