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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Gross unrecognized tax benefits: |  |
Gross unrecognized income tax benefits, beginning of period | $ 139.9 | $ 133.0
Additions for tax positions of the current year | 16.4 | 14.4
Additions for tax positions of prior years | 4.8 | 15.2
Reductions for tax positions of prior years for: |  |
Changes in judgments | 1.4 | (1.2)
Settlements during the year | (0.4) | (13.8)
Lapses of applicable statute of limitations | (14.4) | (5.0)
Foreign currency translation | 15.7 | (2.7)
Gross unrecognized income tax benefits, end of period | $ 163.4 | $ 139.9

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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