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Income Taxes - Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Movement in uncertain tax positions |  |  |
Uncertain tax positions at the beginning of the period | $ 3.5 | $ 3.4 | $ 12.8
Gross increase - tax position in prior periods |  | 0.2 | 0.2
Gross decrease - tax position in prior periods | (3.4) | (0.1) | (0.3)
Settlements |  |  | (7.8)
Foreign exchange |  |  | (1.5)
Uncertain tax positions at the end of the period | 0.1 | $ 3.5 | $ 3.4
Interest and penalties included within uncertain tax positions | 0.0 |  |
Impact of uncertain tax positions on effective tax rate, if recognized | $ 0.1 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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