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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Net sales $ 5,737.4 $ 5,516.6 $ 16,913.1 $ 15,812.7
Cost of sales 4,481.9 4,315.9 13,294.1 12,365.6
Gross profit 1,255.5 1,200.7 3,619.0 3,447.1
Other segment expense items 812.2 719.1 2,394.1 2,204.4
Operating income 443.3 481.6 1,224.9 1,242.7
Depreciation and amortization expense 73.3 69.1 221.5 205.8
Corporate        
Segment Reporting Information [Line Items]        
Net sales 2,255.4 2,161.2 7,072.9 6,492.3
Small Business        
Segment Reporting Information [Line Items]        
Net sales 433.8 379.7 1,269.7 1,143.5
Public        
Segment Reporting Information [Line Items]        
Net sales 2,349.8 2,335.7 6,519.6 6,303.7
Other        
Segment Reporting Information [Line Items]        
Net sales 698.4 640.0 2,050.9 1,873.2
Operating Segments | Corporate        
Segment Reporting Information [Line Items]        
Net sales 2,255.4 2,161.2 7,072.9 6,492.3
Cost of sales 1,734.0 1,651.0 5,444.1 4,951.5
Gross profit 521.4 510.2 1,628.8 1,540.8
Other segment expense items 326.1 301.2 969.7 956.8
Operating income 195.3 209.0 659.1 584.0
Depreciation and amortization expense 29.0 18.8 81.3 57.9
Operating Segments | Small Business        
Segment Reporting Information [Line Items]        
Net sales 433.8 379.7 1,269.7 1,143.5
Cost of sales 334.7 291.5 987.4 877.8
Gross profit 99.1 88.2 282.3 265.7
Other segment expense items 45.4 42.6 137.4 128.0
Operating income 53.7 45.6 144.9 137.7
Depreciation and amortization expense 2.1 0.9 5.1 2.7
Operating Segments | Public        
Segment Reporting Information [Line Items]        
Net sales 2,349.8 2,335.7 6,519.6 6,303.7
Cost of sales 1,859.7 1,858.9 5,230.8 5,029.9
Gross profit 490.1 476.8 1,288.8 1,273.8
Other segment expense items 258.2 236.6 728.2 698.4
Operating income 231.9 240.2 560.6 575.4
Depreciation and amortization expense 19.3 14.2 50.9 41.9
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Net sales 698.4 640.0 2,050.9 1,873.2
Cost of sales 553.5 514.5 1,631.8 1,506.4
Gross profit 144.9 125.5 419.1 366.8
Other segment expense items 101.9 93.0 294.4 284.8
Operating income 43.0 32.5 124.7 82.0
Depreciation and amortization expense 7.3 6.9 21.2 21.1
Headquarters        
Segment Reporting Information [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Cost of sales 0.0 0.0 0.0 0.0
Gross profit 0.0 0.0 0.0 0.0
Other segment expense items 80.6 45.7 264.4 136.4
Operating income (80.6) (45.7) (264.4) (136.4)
Depreciation and amortization expense $ 15.6 $ 28.3 $ 63.0 $ 82.2