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Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest and investment income	$ (36.2)	$ (34.0)
Net realized (gain) loss on investments	0.5	(0.2)
Other Nonoperating (Income)	(0.5)	(0.8)
Other (income) expense, net	$ (37.2)	$ (34.6)

X

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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X

- Definition

Amount of income related to nonoperating activities, classified as other.

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Amount of realized gain (loss) on investment.

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