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Supplemental Financial Information (Other Current Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Supplemental Financial Information [Abstract] |  |
Inventory | $ 219.7 | $ 225.2
Prepaid taxes | 35.8 | 30.7
Deferred costs | 31.4 | 32.4
Prepaid expenses | 14.1 | 7.9
Other | 17.3 | 19.8
Other current assets | $ 318.3 | $ 316.0

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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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