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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Supplemental Financial Information [Abstract] |  |
Prepaid taxes | $ 73.5 | $ 48.5
Deferred costs | 38.6 | 38.6
Prepaid expenses | 15.3 | 13.0
Other | 27.0 | 26.9
Other current assets | $ 154.4 | $ 127.0

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