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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 5,300.0	$ 4,756.4	$ 15,283.9	$ 13,511.3
Income (loss) from operations	386.4	317.8	1,079.7	847.0
Depreciation and amortization expense	(48.2)	(132.4)	(140.0)	(349.0)
Corporate
Segment Reporting Information [Line Items]
Net sales	2,067.3	1,660.0	5,856.2	5,128.5
Small Business
Segment Reporting Information [Line Items]
Net sales	467.1	337.0	1,382.7	1,030.6
Public
Segment Reporting Information [Line Items]
Net sales	2,153.9	2,293.8	6,156.3	5,841.2
Other
Segment Reporting Information [Line Items]
Net sales	611.7	465.6	1,888.7	1,511.0
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Net sales	2,067.3	1,660.0	5,856.2	5,128.5
Income (loss) from operations	186.0	128.5	522.6	378.9
Depreciation and amortization expense	(4.1)	(22.4)	(11.9)	(66.8)
Operating Segments | Small Business
Segment Reporting Information [Line Items]
Net sales	467.1	337.0	1,382.7	1,030.6
Income (loss) from operations	41.4	24.3	128.2	72.6
Depreciation and amortization expense	(0.9)	(5.6)	(2.5)	(17.0)
Operating Segments | Public
Segment Reporting Information [Line Items]
Net sales	2,153.9	2,293.8	6,156.3	5,841.2
Income (loss) from operations	178.7	196.1	468.7	468.4
Depreciation and amortization expense	(16.9)	(77.2)	(46.4)	(184.0)
Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	611.7	465.6	1,888.7	1,511.0
Income (loss) from operations	21.9	18.7	73.3	49.9
Depreciation and amortization expense	(8.5)	(8.4)	(25.7)	(24.3)
Headquarters
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Income (loss) from operations	(41.6)	(49.8)	(113.1)	(122.8)
Depreciation and amortization expense	$ (17.8)	$ (18.8)	$ (53.5)	$ (56.9)

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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