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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Supplemental Financial Information [Abstract] |  |
Deferred costs | $ 78.9 | $ 59.1
Prepaid taxes | 48.4 | 44.6
Prepaid expenses | 23.9 | 17.5
Other | 27.5 | 27.4
Other current assets | $ 178.7 | $ 148.6

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