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Other Balance Sheet Items Other Balance Sheet Items (Goodwill) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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