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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Supplemental Financial Information [Abstract] |  |
Inventory | $ 270.7 | $ 278.8
Prepaid taxes | 70.2 | 43.5
Deferred costs | 29.7 | 29.7
Prepaid expenses | 19.5 | 14.2
Derivative asset | 0.4 | 6.8
Other | 13.5 | 8.2
Other current assets | $ 404.0 | $ 381.2

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