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Accounting Policies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
branches
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nontrade Receivables $ 233.1 $ 246.2  
Accounts Receivable, Allowance for Credit Loss, Current 55.9 46.5  
Accounts Receivable, Credit Loss Expense (Reversal) 18.6 18.0 $ 12.9
Inventory Valuation Reserves 113.4 70.0  
Inventory Write-down 63.1 43.2 $ 37.1
Intangible Assets, Net (Including Goodwill) 4,100.0 4,000.0  
Self Insurance Reserve $ 28.1 $ 28.0  
Supplier volume rebate income percentage 1.40% 1.60% 1.40%
Number of Locations | branches 800    
Property, buildings and equipment, net $ 423.6 $ 402.7  
Finite-Lived Intangible Assets, Amortization Expense 88.6 92.9 $ 119.6
Supplier Finance Program, Obligation 32.6 30.7  
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, after Accumulated Amortization 195.4 104.1  
Hosting Arrangement, Service Contract, Implementation Cost, Capitalized, Accumulated Amortization $ 15.5 $ 6.1  
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] Accounts payable Accounts payable  
Restricted Cash $ 21.9 $ 21.2  
Leasehold Improvements      
Property, Plant, and Equipment, Additional Disclosures five to forty years    
Furniture and Fixtures [Member]      
Property, Plant, and Equipment, Additional Disclosures three to eight years    
Software and Software Development Costs [Member]      
Property, Plant, and Equipment, Additional Disclosures three to seven years    
Land, Buildings and Improvements      
Property, buildings and equipment, net $ 152.8    
Minimum      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years    
Maximum      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 20 years