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Income taxes - Reconciliations between statutory federal income tax rate and effective income tax rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
Tax effect of international items | (5.30%) | (11.30%) | (3.30%)
Impacts of the TCJA | 0 | 0 | (0.010)
Legal entity merger - deferred taxes | 0.00% | (38.00%) | 0.00%
Excess tax benefits related to share-based compensation | (4.90%) | (4.50%) | (7.20%)
State taxes, net of federal benefit | (0.30%) | (4.90%) | (0.10%)
Uncertain tax contingencies | (0.50%) | 0.00% | (0.40%)
Contingent consideration | (2.20%) | 3.40% | 5.30%
Intellectual property impairment charge | (1.20%) | 0.00% | (2.00%)
Research and development tax credit | (1.10%) | (1.10%) | (1.60%)
Other, net | 0.60% | (0.50%) | (0.10%)
Effective income tax rate, total | 6.10% | (35.90%) | 10.60%
Increase (decrease) in deferred tax liability due to merger of foreign subsidiaries | $ (129.0) |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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