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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Net sales $ 4,756.4 $ 4,907.7 $ 13,511.3 $ 13,495.5
Income (loss) from operations 317.8 320.6 847.0 849.8
Depreciation and amortization expense (132.4) (68.2) (349.0) (197.5)
Operating Segments | Corporate        
Segment Reporting Information [Line Items]        
Net sales 1,660.0 1,913.5 5,128.5 5,533.6
Income (loss) from operations 128.5 138.9 378.9 430.8
Depreciation and amortization expense (22.4) (21.7) (66.8) (64.8)
Operating Segments | Small Business        
Segment Reporting Information [Line Items]        
Net sales 337.0 386.2 1,030.6 1,119.2
Income (loss) from operations 24.3 27.2 72.6 78.2
Depreciation and amortization expense (5.6) (5.6) (17.0) (16.8)
Operating Segments | Public        
Segment Reporting Information [Line Items]        
Net sales 2,293.8 2,100.9 5,841.2 5,271.7
Income (loss) from operations 196.1 168.4 468.4 373.9
Depreciation and amortization expense (77.2) (15.0) (184.0) (41.4)
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Net sales 465.6 507.1 1,511.0 1,571.0
Income (loss) from operations 18.7 21.9 49.9 66.6
Depreciation and amortization expense (8.4) (7.9) (24.3) (23.1)
Headquarters        
Segment Reporting Information [Line Items]        
Net sales 0.0 0.0 0.0 0.0
Income (loss) from operations (49.8) (35.8) (122.8) (99.7)
Depreciation and amortization expense $ (18.8) $ (18.0) $ (56.9) $ (51.4)