| Explanation of adjustments of numerator to calculate diluted earnings per share | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Concept not required as a result of 2020 general improvements | en | http://www.xbrl.org/2009/role/deprecatedLabel | http://www.xbrl.org/2003/role/link |
| 2021-01-01 | en | http://www.xbrl.org/2009/role/deprecatedDateLabel | http://www.xbrl.org/2003/role/link |
| The explanation of the adjustments made to numerator in the calculation of the diluted earnings per share. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |