Supplemental Financial Information (Interest Income (Expense), Net) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Supplemental Income Statement Elements [Abstract]
Interest on revolving credit facility	$ 0.0	$ 0.0	$ 0.0	$ (0.5)
Line of credit fees	(0.3)	(0.2)	(0.9)	(0.8)
Debt issuance amortization costs	(0.2)	(0.2)	(0.4)	(0.4)
Interest income	0.7	0.5	2.3	0.8
Other	0.0	(0.1)	(0.1)	(0.1)
Total interest income (expense), net	$ 0.2	$ 0.0	$ 0.9	$ (1.0)

Amount of amortization expense attributable to debt issuance costs.

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Aggregate amount of interest paid or due on all long-term debt.

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Amount of interest expense classified as other.

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Amount of interest income (expense) classified as operating.

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Amount of the fee for available but unused credit capacity under the credit facility.

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