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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

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