Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 6,215.5	$ 5,300.0	$ 18,310.4	$ 15,283.9
Income (loss) from operations	466.4	386.4	1,288.6	1,079.7
Depreciation and amortization expense	(75.6)	(48.2)	(218.1)	(140.0)
Corporate
Segment Reporting Information [Line Items]
Net sales	2,577.8	2,067.3	7,866.1	5,856.2
Small Business
Segment Reporting Information [Line Items]
Net sales	491.2	467.1	1,515.2	1,382.7
Public
Segment Reporting Information [Line Items]
Net sales	2,424.3	2,153.9	6,700.3	6,156.3
Other
Segment Reporting Information [Line Items]
Net sales	722.2	611.7	2,228.8	1,888.7
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Net sales	2,577.8	2,067.3	7,866.1	5,856.2
Income (loss) from operations	203.3	186.0	644.5	522.6
Depreciation and amortization expense	(30.8)	(4.1)	(79.4)	(11.9)
Operating Segments | Small Business
Segment Reporting Information [Line Items]
Net sales	491.2	467.1	1,515.2	1,382.7
Income (loss) from operations	47.0	41.4	140.7	128.2
Depreciation and amortization expense	(3.1)	(0.9)	(6.4)	(2.5)
Operating Segments | Public
Segment Reporting Information [Line Items]
Net sales	2,424.3	2,153.9	6,700.3	6,156.3
Income (loss) from operations	234.0	178.7	553.0	468.7
Depreciation and amortization expense	(11.9)	(16.9)	(44.7)	(46.4)
Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	722.2	611.7	2,228.8	1,888.7
Income (loss) from operations	32.3	21.9	96.8	73.3
Depreciation and amortization expense	(7.7)	(8.5)	(24.2)	(25.7)
Headquarters
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Income (loss) from operations	(50.2)	(41.6)	(146.4)	(113.1)
Depreciation and amortization expense	$ (22.1)	$ (17.8)	$ (63.4)	$ (53.5)