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Postretirement Benefit Plans (Debt Securities, Trading, and Equity Securities, FV-NI) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Adjusted Cost	$ 4.1	$ 4.8
Unrealized Gains	0.9	0.5
Unrealized Losses	0.0	0.0
Fair Value	5.0	5.3
Level 1 Securities:
Defined Benefit Plan Disclosure [Line Items]
Adjusted Cost	4.0	4.6
Unrealized Gains	0.9	0.5
Unrealized Losses	0.0	0.0
Fair Value	4.9	5.1
Level 2 Securities:
Defined Benefit Plan Disclosure [Line Items]
Adjusted Cost	0.1	0.2
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	$ 0.1	$ 0.2

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Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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