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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Net sales $ 5,679.8 $ 5,199.1
Cost of sales 4,489.8 4,076.8
Gross profit 1,190.0 1,122.3
Other segment expense items 814.0 760.9
Operating income (loss) 376.0 361.4
Depreciation and amortization expense 74.9 74.9
Commercial    
Segment Reporting Information [Line Items]    
Net sales 3,569.4 3,255.3
Government    
Segment Reporting Information [Line Items]    
Net sales 632.9 604.9
Education    
Segment Reporting Information [Line Items]    
Net sales 675.0 658.5
Other    
Segment Reporting Information [Line Items]    
Net sales 802.5 680.4
Operating Segments | Commercial    
Segment Reporting Information [Line Items]    
Net sales 3,569.4 3,255.3
Cost of sales 2,771.3 2,505.5
Gross profit 798.1 749.8
Other segment expense items 443.4 389.1
Operating income (loss) 354.7 360.7
Depreciation and amortization expense 26.8 26.6
Operating Segments | Government    
Segment Reporting Information [Line Items]    
Net sales 632.9 604.9
Cost of sales 508.2 470.0
Gross profit 124.7 134.9
Other segment expense items 99.5 109.4
Operating income (loss) 25.2 25.5
Depreciation and amortization expense 10.5 12.3
Operating Segments | Education    
Segment Reporting Information [Line Items]    
Net sales 675.0 658.5
Cost of sales 562.5 553.1
Gross profit 112.5 105.4
Other segment expense items 73.1 80.1
Operating income (loss) 39.4 25.3
Depreciation and amortization expense 3.7 4.2
Operating Segments | Other    
Segment Reporting Information [Line Items]    
Net sales 802.5 680.4
Cost of sales 647.8 548.2
Gross profit 154.7 132.2
Other segment expense items 108.2 93.1
Operating income (loss) 46.5 39.1
Depreciation and amortization expense 7.8 6.8
Headquarters    
Segment Reporting Information [Line Items]    
Net sales 0.0 0.0
Cost of sales 0.0 0.0
Gross profit 0.0 0.0
Other segment expense items 89.8 89.2
Operating income (loss) (89.8) (89.2)
Depreciation and amortization expense $ 26.1 $ 25.0