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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net sales $ 20,820.8 $ 18,467.5 $ 18,032.4
Income (loss) from operations 1,419.0 1,179.2 1,133.6
Depreciation and amortization expense (191.2) (425.6) (267.1)
Operating Segments | Corporate      
Segment Reporting Information [Line Items]      
Net sales 8,179.7 6,846.0 7,499.0
Income (loss) from operations 697.3 489.5 585.1
Depreciation and amortization expense (22.9) (73.2) (86.9)
Operating Segments | Small Business      
Segment Reporting Information [Line Items]      
Net sales 1,870.1 1,397.1 1,510.3
Income (loss) from operations 167.7 99.0 107.5
Depreciation and amortization expense (4.1) (18.3) (22.5)
Operating Segments | Public      
Segment Reporting Information [Line Items]      
Net sales 8,183.6 8,137.7 6,864.8
Income (loss) from operations 606.7 678.2 475.0
Depreciation and amortization expense (57.2) (229.7) (56.3)
Operating Segments | Other      
Segment Reporting Information [Line Items]      
Net sales 2,587.4 2,086.7 2,158.3
Income (loss) from operations 115.8 65.9 101.6
Depreciation and amortization expense (34.4) (32.5) (31.2)
Headquarters      
Segment Reporting Information [Line Items]      
Net sales 0.0 0.0 0.0
Income (loss) from operations (168.5) (153.4) (135.6)
Depreciation and amortization expense $ (72.6) $ (71.9) $ (70.2)