Fair Value (Fair Value and Cost of Non-Derivative Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Long-term Debt	$ 1,385.7	$ 1,384.8
Money Market Funds [Member] \| Fair Value [Member]
Investments, Fair Value Disclosure	$ 0.4	$ 0.8

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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

+ References

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+ Details