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Supplemental Financial Information (Other Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Supplemental Financial Information [Abstract]    
Unrecognized tax benefits (inclusive of interest and penalties) $ 206.4 $ 224.0
Pension and other post-retirement benefits 139.5 141.6
Lease liabilities 49.8 48.9
Noncurrent contract liabilities (deferred revenue) 36.2 37.6
Other 19.8 19.6
Other liabilities $ 451.7 $ 471.7