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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Supplemental Financial Information [Abstract] |  |
Current contract liabilities (deferred revenues) | $ 122.3 | $ 116.2
Personnel costs | 69.1 | 76.6
Income and other taxes payable | 61.7 | 52.9
Accrued claims | 15.0 | 20.4
Accrued interest | 38.4 | 15.4
Lease liabilities | 29.5 | 27.2
Other | 30.5 | 35.5
Accrued liabilities and other | $ 366.5 | $ 344.2

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