Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Investments in an Associate - Summarised Financial Information Relating to Swissfillon AG (Parenthetical) (Details)

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Investments in an Associate - Summarised Financial Information Relating to Swissfillon AG (Parenthetical) (Details)
12 Months Ended
Dec. 31, 2020
Swissfillon AG  
Disclosure Of Significant Investments In Associates [Line Items]  
Proportion of ownership interest In associate 26.94%