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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Supplemental Financial Information [Abstract] |  |
Unrecognized tax benefits (inclusive of interest and penalties) | $ 234.5 | $ 275.0
Pension and other post-retirement benefits | 155.3 | 159.8
Noncurrent contract liabilities (deferred revenue) | 43.3 | 41.0
Other | 49.4 | 39.8
Other liabilities | $ 482.5 | $ 515.6

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