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Commitments and contingencies (Details) - Belgium - Foreign tax authority - EUR (€) € in Thousands |  | 36 Months Ended
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Mar. 10, 2020 | Dec. 31, 2014
2005 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | € 46,135
2006 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | 38,817
2007 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | 39,635
2008 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | 30,131
2009 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | 35,567
2010 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) |  | € 43,117
2016 |  |
Commitments And Contingencies [Line Items] |  |
Assessment received from Belgian tax authority (in euros) | € 67,959 |

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