Supplementary Financial Information- Schedule of Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Offsetting [Abstract]
Gain on step-up of equity method investment	$ 0.0	$ 0.0	$ 4.4	$ 0.0
Net gain (loss) on repurchase or extinguishment of debt	0.0	1.9	(0.3)	(0.3)
Interest income	0.1	0.9	0.6	1.9
Foreign currency translation gains (losses)	0.1	(0.6)	(0.8)	(0.4)
Fair value gains on securities	0.3	0.0	0.8	0.0
Other	0.1	0.0	(0.4)	0.0
Total other income, net	$ 0.6	$ 2.2	$ 4.3	$ 1.2

Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

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