Fair Value Measurements and Investments Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Long-term debt	$ 1,203.4	$ 1,203.0
Total long-term debt, excluding leases and current maturities	1,148.5	1,162.6
Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	1,193.5	1,193.0
Total long-term debt, excluding leases and current maturities	1,138.6	1,152.6
Other Long-Term Debt \| Other Long-Term Debt
Debt Instrument [Line Items]
Long-term debt	9.9	10.0
Total long-term debt, excluding leases and current maturities	$ 9.9	$ 10.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ Details