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Income Taxes Uncertain Tax Provisions (Details 6) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods | $ 20.5 |  |
Effective income tax rate reconciliation, resolution of Advanced Pricing Agreement, amount |  |  | $ (85.8)
Changes in unrecognized tax benefits for all jurisdictions were as follows: |  |  |
Gross unrecognized tax benefits, beginning of period | 39.3 | $ 27.1 | 98.6
Prior year tax positions - increases | 0.3 | 1.9 | 13.5
Current year tax positions | 3.8 | 8.5 | 6.9
Prior year tax positions - decreases | (2.9) | 0.0 | (91.6)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation |  | 1.8 |
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation | (2.4) |  | (0.3)
Gross unrecognized tax benefits, end of period | 38.1 | 39.3 | $ 27.1
Accrued interest and penalties related to unrecognized tax benefits, which are reflected in other noncurrent liabilities | 4.9 | $ 4.1 |
Non-US |  |  |
Income Tax Contingency [Line Items] |  |  |
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods | 0.7 |  |
Changes in unrecognized tax benefits for all jurisdictions were as follows: |  |  |
Prior year tax positions - increases | $ 1.2 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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