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Other Balance Sheet Items Other Balance Sheet Items (Goodwill) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Goodwill, Gross	$ 1,537.8	$ 1,537.8
Goodwill, Impaired, Accumulated Impairment Loss	(1,485.3)	(1,485.3)
Goodwill	$ 52.5	$ 52.5

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