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Income taxes (Reconciliation of Federal Statutory Tax Rate) (Details)	12 Months Ended
	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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