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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 149.9 $ 224.0
Pension and other post-retirement benefits 121.3 141.6
Operating Lease, Liability, Noncurrent 62.0 48.9
Noncurrent contract liabilities (deferred revenue) 49.0 37.6
Other 22.2 19.6
Other liabilities $ 404.4 $ 471.7