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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 5,146.4	$ 4,365.7	$ 9,983.9	$ 8,754.9
Income (loss) from operations	369.9	283.4	693.3	529.2
Depreciation and amortization expense	(46.6)	(125.2)	(91.8)	(216.6)
Corporate
Segment Reporting Information [Line Items]
Net sales	1,983.3	1,557.5	3,788.9	3,468.5
Small Business
Segment Reporting Information [Line Items]
Net sales	482.9	302.1	915.6	693.6
Public
Segment Reporting Information [Line Items]
Net sales	2,080.7	2,022.1	4,002.4	3,547.4
Other
Segment Reporting Information [Line Items]
Net sales	599.5	484.0	1,277.0	1,045.4
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Net sales	1,983.3	1,557.5	3,788.9	3,468.5
Income (loss) from operations	175.2	123.0	336.6	250.4
Depreciation and amortization expense	(3.8)	(22.1)	(7.8)	(44.4)
Operating Segments | Small Business
Segment Reporting Information [Line Items]
Net sales	482.9	302.1	915.6	693.6
Income (loss) from operations	44.0	21.0	86.8	48.3
Depreciation and amortization expense	(0.8)	(5.6)	(1.6)	(11.4)
Operating Segments | Public
Segment Reporting Information [Line Items]
Net sales	2,080.7	2,022.1	4,002.4	3,547.4
Income (loss) from operations	153.3	159.9	290.0	272.3
Depreciation and amortization expense	(16.1)	(69.1)	(29.5)	(106.8)
Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	599.5	484.0	1,277.0	1,045.4
Income (loss) from operations	23.7	16.5	51.4	31.2
Depreciation and amortization expense	(8.6)	(7.9)	(17.2)	(15.9)
Headquarters
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Income (loss) from operations	(26.3)	(37.0)	(71.5)	(73.0)
Depreciation and amortization expense	$ (17.3)	$ (20.5)	$ (35.7)	$ (38.1)

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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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