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Accounting Policies - Income tax (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018
Income Taxes |  |
Gross unrecognized tax benefits | $ 7.7 | $ 10.2
Amount of unrecognized tax benefits which, if recognized, would affect the effective tax rate |  | 4.5
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |
Balance at the beginning of the period | 7.7 |
Increases related to prior year tax positions | 2.5 |
Increases related to current year tax positions | 2.5 |
Settlements | (2.1) |
Currency movement | (0.4) |
Balance at the end of the period | $ 10.2 |
Decrease in unrecognized tax benefits, that is reasonably possible |  | $ 0.5
Buildings and improvements | Minimum |  |
Property, plant and equipment |  |
Estimated useful lives of the assets | 10 years |
Buildings and improvements | Maximum |  |
Property, plant and equipment |  |
Estimated useful lives of the assets | 40 years |
Machinery and equipment | Minimum |  |
Property, plant and equipment |  |
Estimated useful lives of the assets | 3 years |
Machinery and equipment | Maximum |  |
Property, plant and equipment |  |
Estimated useful lives of the assets | 15 years |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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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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