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Contingent Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2021
Sep. 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   25.6 $ 24.3
New York State Division of Taxation and Finance      
Loss Contingencies [Line Items]      
Sales and excise tax payable   3.0  
IRS | Section 199 Tax Case      
Loss Contingencies [Line Items]      
Reserve in connection with disallowance   33.1 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 resulting from settlements with taxing authorities   $ 2.6