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Available-for-Sale Debt Securities - Schedule of Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 125.9	$ 265.1
Less Than 12 Months, Unrealized Loss	(0.1)	(0.4)
12 Months or Longer, Fair Value	49.1	183.8
12 Months or Longer, Unrealized Loss	(0.1)	(1.0)
Total, Fair Value	175.0	448.9
Total, Unrealized Loss	(0.2)	(1.4)
Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	84.8	214.6
Less Than 12 Months, Unrealized Loss	(0.1)	(0.2)
12 Months or Longer, Fair Value	0.0	16.7
12 Months or Longer, Unrealized Loss	0.0	(0.4)
Total, Fair Value	84.8	231.3
Total, Unrealized Loss	$ (0.1)	$ (0.6)

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