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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Gross unrecognized tax benefits: |  |
Gross unrecognized income tax benefits, beginning of period | $ 163.4 | $ 139.9
Additions for tax positions of the current year | 3.8 | 16.4
Additions for tax positions of prior years | 13.1 | 4.8
Reductions for tax positions of prior years for: |  |
Changes in judgments | (1.6) | 1.4
Settlements during the year | (0.7) | (0.4)
Lapses of applicable statute of limitations | (4.4) | (14.4)
Gross unrecognized income tax benefits, end of period | 166.1 | 163.4
Unrecognized Tax Benefits, Foreign Currency Translation | $ 7.5 | $ (15.7)

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