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Income taxes (Reconciliation of Federal Statutory Tax Rate) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 35.00% | 35.00%
2017 Tax Act, net repatriation tax | 0.00% | 70.70% | 0.00%
Foreign earnings | (4.30%) | (15.80%) | (15.50%)
2017 Tax Act, net deferred tax remeasurement | 0.00% | (6.90%) | 0.00%
Credits, Puerto Rico Excise Tax | (2.50%) | (2.20%) | (2.30%)
2017 Tax Act, net impact on intercompany sales | (1.80%) | (0.00%) | (0.00%)
Interest on uncertain tax positions | 1.20% | 0.60% | 0.50%
Credits, primarily federal R&D | (0.80%) | (0.60%) | (0.70%)
Share-based payments | (0.20%) | (0.70%) | (1.30%)
Other, net | (0.50%) | (0.70%) | 0.00%
Effective tax rate | 12.10% | 79.40% | 15.70%

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