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Available-for-Sale Debt Securities - Gross Unrealized Losses and Fair Value Available-for-Sale Debt Securities in Unrealized Loss Position (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 334.9	$ 265.1
Less Than 12 Months, Unrealized Losses	(1.1)	(0.4)
12 Months or Longer, Fair Value	0.0	183.8
12 Months or Longer, Unrealized Loss	0.0	(1.0)
Total Fair Value	334.9	448.9
Total Unrealized Losses	(1.1)	(1.4)
Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	123.8	214.6
Less Than 12 Months, Unrealized Losses	(0.6)	(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	123.8	231.3
Total Unrealized Losses	$ (0.6)	$ (0.6)

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