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Equity (Schedule of Outstanding Share-Based Compensation Awards) (Details) - shares | Dec. 31, 2019 | Dec. 31, 2018
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Options | Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 588,258 | 580,254
Options | Class B |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 0 |
Options | Class C |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 3,506,568 | 2,667,506
SARs | Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 16,251,617 | 15,308,562
SARs | Class B |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 0 |
SARs | Class C |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 35,682,862 | 34,401,980
RSUs | Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 515,496 |
RSUs | Class B |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 48,786 |
RSUs | Class C |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 1,026,010 |
PSUs and PSARS | Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 7,459,987 |
PSUs and PSARS | Class B |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 1,330,000 |
PSUs and PSARS | Class C |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 14,919,280 |

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