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Contingent Liabilities (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Aug. 31, 2021 | Dec. 31, 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 |  | 24.3 | $ 24.3
IRS | Section 199 Tax Case |  |  |
Loss Contingencies [Line Items] |  |  |
Reserve in connection with disallowance |  |  | 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] |  |  |
Tax adjustments | $ 0.1 |  |
Decrease from settlement with taxing authorities |  | 2.6 |
New York State Division of Taxation and Finance |  |  |
Loss Contingencies [Line Items] |  |  |
Sales and excise tax payable |  | 3.1 |
Ohio Department of Taxation Audit Division |  |  |
Loss Contingencies [Line Items] |  |  |
Sales and excise tax payable |  | $ 1.2 |

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