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Taxation Taxation (Summary Of Income Tax Examinations) (Details) | 12 Months Ended
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Dec. 31, 2019
Earliest Tax Year [Member] | Switzerland |
Income Tax Examination [Line Items] |
Open Tax Year | 2015
Earliest Tax Year [Member] | AUSTRALIA |
Income Tax Examination [Line Items] |
Open Tax Year | 2014
Earliest Tax Year [Member] | CANADA |
Income Tax Examination [Line Items] |
Open Tax Year | 2012
Earliest Tax Year [Member] | FRANCE |
Income Tax Examination [Line Items] |
Open Tax Year | 2017
Earliest Tax Year [Member] | GERMANY |
Income Tax Examination [Line Items] |
Open Tax Year | 2015
Earliest Tax Year [Member] | ITALY |
Income Tax Examination [Line Items] |
Open Tax Year | 2010
Earliest Tax Year [Member] | MEXICO |
Income Tax Examination [Line Items] |
Open Tax Year | 2014
Earliest Tax Year [Member] | SPAIN |
Income Tax Examination [Line Items] |
Open Tax Year | 2012
Earliest Tax Year [Member] | UNITED KINGDOM |
Income Tax Examination [Line Items] |
Open Tax Year | 2015
Earliest Tax Year [Member] | UNITED STATES |
Income Tax Examination [Line Items] |
Open Tax Year | 2014
Latest Tax Year [Member] | Switzerland |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | AUSTRALIA |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | CANADA |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | FRANCE |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | GERMANY |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | ITALY |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | MEXICO |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | SPAIN |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | UNITED KINGDOM |
Income Tax Examination [Line Items] |
Open Tax Year | 2019
Latest Tax Year [Member] | UNITED STATES |
Income Tax Examination [Line Items] |
Open Tax Year | 2019

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