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Debt Securities - Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 248.0 | $ 199.5
Less Than 12 Months, Unrealized Loss | (2.4) | (1.9)
12 Months or Longer, Fair Value | 225.8 | 299.1
12 Months or Longer, Unrealized Loss | (2.9) | (5.6)
Total, Fair Value | 473.8 | 498.6
Total, Unrealized Loss | (5.3) | (7.5)
Securities of government-sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 262.8 | 107.7
Less Than 12 Months, Unrealized Loss | (2.3) | (2.5)
12 Months or Longer, Fair Value | 76.3 | 198.4
12 Months or Longer, Unrealized Loss | (1.1) | (4.5)
Total, Fair Value | 339.1 | 306.1
Total, Unrealized Loss | $ (3.4) | (7.0)
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value |  | 32.1
Less Than 12 Months, Unrealized Loss |  | (0.2)
12 Months or Longer, Fair Value |  | 0.0
12 Months or Longer, Unrealized Loss |  | 0.0
Total, Fair Value |  | 32.1
Total, Unrealized Loss |  | $ (0.2)

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