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Contingent Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
YP Acquisition |  |
Loss Contingencies [Line Items] |  |
Amount to be paid before allowance of tax credit | $ 8.0 |
Value of escrowed stock | 25.2 | $ 24.3
New York State Division of Taxation and Finance |  |
Loss Contingencies [Line Items] |  |
Sales and excise tax payable | 2.8 |
IRS | Section 199 Tax Case |  |
Loss Contingencies [Line Items] |  |
Reserve in connection with disallowance | 32.7 | 31.9
Amount to be paid before allowance of tax credit | 8.0 |
IRS | Research and Development Tax Case |  |
Loss Contingencies [Line Items] |  |
Reserve in connection with disallowance | 0.1 | $ 0.2
Texas Comptroller |  |
Loss Contingencies [Line Items] |  |
Sales and excise tax payable | $ 2.6 |

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