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Supplemental Financial Information (Cash Flows Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Supplemental Financial Information [Abstract]
(Increase) decrease in accounts receivable	$ 119.2	$ (64.9)	$ 44.9
(Increase) decrease in other assets	2.6	23.4	(6.5)
(Decrease) increase in liabilities	(42.9)	(91.7)	82.8
Changes in operating assets and liabilities	78.9	(133.2)	$ 121.2
Deposit Liabilities, Collateral Issued, Financial Instruments	16.3	10.8
Cash and cash equivalents	599.4	368.2
Restricted Cash, Current	7.0	12.3
Restricted Cash, Noncurrent	11.1	0.0
Restricted Cash	$ 617.5	$ 380.5

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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