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Supplemental Balance Sheet Information (Goodwill) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Statement of Financial Position [Abstract]    
Goodwill, Gross   $ 821.1
Goodwill, Impaired, Accumulated Impairment Loss   (740.4)
Goodwill $ 81.5 $ 80.7
Goodwill, Foreign Currency Translation Gain (Loss) $ 0.8