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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Supplemental Financial Information [Abstract] |  |
Inventory | $ 281.9 | $ 278.8
Prepaid taxes | 47.3 | 43.5
Deferred costs | 38.8 | 29.7
Prepaid expenses | 14.2 | 14.2
Derivative Asset, Current | 7.1 | 6.8
Assets Held-for-sale, Not Part of Disposal Group, Current | 5.2 | 1.5
Other | 15.7 | 6.7
Other current assets | $ 410.2 | $ 381.2

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