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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details)
1 Months Ended 12 Months Ended
Jun. 14, 2021
USD ($)
May 31, 2022
business
Dec. 31, 2021
USD ($)
business
Nov. 30, 2021
business
Dec. 31, 2021
USD ($)
business
Jul. 05, 2022
USD ($)
store
Jun. 30, 2022
USD ($)
Dec. 28, 2021
USD ($)
Jun. 30, 2021
USD ($)
Business Acquisition [Line Items]                  
Number of businesses acquired | business         6        
Acquisition purchase price         $ 392,400,000        
Business Acquisition, Transaction Costs                 $ 1,400,000
Goodwill expected to be deductible for income tax purposes     $ 80,000,000   $ 80,000,000        
Education [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business       1 2        
Other Businesses [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business         1        
Other Businesses [Member] | Leaf Group [Member]                  
Business Acquisition [Line Items]                  
Stock Compensation Liabilities Assumed $ 9,200,000                
Acquisition purchase price $ 308,600,000                
Graham Healthcare Group [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business   2 2   2        
Graham Healthcare Group [Member] | Weiss | Maximum [Member]                  
Business Acquisition [Line Items]                  
Percentage of Shares Eligible to be Redeemed     10.00%   10.00%        
Graham Healthcare Group [Member] | Weiss                  
Business Acquisition [Line Items]                  
Percentage of interest acquired     50.10%   50.10%        
Redeemable noncontrolling interest     $ 6,600,000   $ 6,600,000        
Automotive [Member]                  
Business Acquisition [Line Items]                  
Number of businesses acquired | business         1        
Floor plan payables             $ 45,700,000    
Automotive [Member] | Ford auto dealership                  
Business Acquisition [Line Items]                  
Amount Borrowed to Finance Business Acquisition               $ 22,500,000  
Floor plan payables               $ 16,200,000  
Subsequent Event [Member] | Automotive [Member] | Auto dealerships [Member]                  
Business Acquisition [Line Items]                  
Amount Borrowed to Finance Business Acquisition           $ 77,400,000      
Floor plan payables           $ 10,900,000      
Number of Stores | store           2