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Income Taxes - Reconciliation between Statutory Income Tax Rate and Effective Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
U.S. Statutory Tax Rate | 21.00% | 21.00% | 21.00%
Increase Due to State and Local Taxes | 3.70% | 4.20% | 3.60%
Rate Benefits as a Limited Liability Company/Flow | (2.20%) | (2.50%) | (2.60%)
Foreign Taxes | (1.10%) | (0.10%) | 0.20%
Non-Deductible Expenses(1) | 0.70% | 1.60% | 1.20%
ASU 2016-09 Benefit for Stock Compensation | 0.00% | (2.70%) | (4.20%)
Tax Cuts and Jobs Act - Primarily Related to the Re-measurement of Net Deferred Tax Assets | 0.00% | 0.00% | 0.10%
Valuation Allowances | 1.80% | 0.30% | 0.30%
Other Adjustments | (0.20%) | (0.60%) | 0.10%
Effective Income Tax Rate | 23.70% | 21.20% | 19.70%

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