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Intangible Assets And Goodwill (Components of Goodwill) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]      
Goodwill $ 10,489.6 $ 10,495.3 $ 10,482.5
Goodwill, Foreign Currency Translation Gain (Loss) $ (5.7) $ 12.8