Supplemental Financial Information (Schedule of Components of Other Operating (Income) Expense, Net) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
UTIS fire
Inventory charges	$ 0.0	$ 0.0	$ 0.2
Professional services	0.0	0.9	1.4
Lease obligations	0.0	0.0	0.4
Compensation & benefits	0.0	0.0	2.4
Other	0.0	0.0	(0.2)
Insurance recoveries	0.0	(31.4)	(6.6)
Total UTIS fire	0.0	(30.5)	(2.4)
Regulatory termination fee, net	0.0	0.0	(142.1)
Loss (gain) on sale or disposal of property, plant and equipment	0.1	(2.6)	0.5
Total other operating (income) expense, net	$ 0.1	$ (33.1)	$ (144.0)

Catastrophic Event

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Catastrophic Event, Compensation and Benefits

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Catastrophic Event, Inventory Charges

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Catastrophic Event, Lease Obligations

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Amount of excess (deficiency) of insurance recovery over the loss incurred from an insured event.

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Amount of other expense (income) that is infrequent in occurrence or unusual in nature.

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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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