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Basis of Presentation and Significant Accounting Policies (Details)
shares in Millions
3 Months Ended 9 Months Ended
Dec. 01, 2020
Sep. 30, 2021
segment
shares
Sep. 30, 2020
shares
Sep. 30, 2021
shares
Sep. 30, 2020
shares
Debt Instrument [Line Items]          
Number of operating segments   1      
Number of reportable segments   1      
Common stock equivalents included in diluted per share data (in shares) | shares   1.8 1.6 2.0 1.9
London Interbank Offered Rate (LIBOR) | PNC Bank Facility | Minimum | Term Loan          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 1.75%     1.75%  
London Interbank Offered Rate (LIBOR) | PNC Bank Facility | Maximum | Term Loan          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 2.25%     2.25%