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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2023
business
Nov. 30, 2022
USD ($)
Aug. 31, 2022
business
May 31, 2022
business
Dec. 31, 2022
USD ($)
business
Mar. 31, 2023
USD ($)
Jul. 31, 2022
Jul. 05, 2022
USD ($)
store
Business Acquisition [Line Items]                
Acquisition purchase price         $ 143.2      
Goodwill expected to be deductible for income tax purposes         $ 38.5      
Number of businesses acquired | business         7      
Automotive [Member]                
Business Acquisition [Line Items]                
Floor plan payables           $ 76.9    
Number of businesses acquired | business         2      
Graham Healthcare Group [Member]                
Business Acquisition [Line Items]                
Number of businesses acquired | business 2   2 2 5      
CSI Pharmacy Holding Company, LLC                
Business Acquisition [Line Items]                
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   $ 1.2            
Graham Holdings Company [Member] | CSI Pharmacy Holding Company, LLC                
Business Acquisition [Line Items]                
Percentage Ownership After Change in Noncontrolling Interest           76.50%    
Auto dealerships [Member] | Automotive [Member]                
Business Acquisition [Line Items]                
Amount Borrowed to Finance Business Acquisition               $ 77.4
Floor plan payables               $ 10.9
Number of Stores | store               2
Applied Behavior Analysis clinics | Graham Healthcare Group [Member]                
Business Acquisition [Line Items]                
Percentage of interest acquired             100.00%