Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 4,872.7	$ 5,103.1
Operating income (loss)	328.0	355.3
Depreciation and amortization expense	(67.3)	(70.7)
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Net sales	2,135.9	2,203.7
Operating income (loss)	178.0	193.3
Depreciation and amortization expense	(19.8)	(22.8)
Operating Segments | Small Business
Segment Reporting Information [Line Items]
Net sales	380.9	411.4
Operating income (loss)	46.5	41.5
Depreciation and amortization expense	(1.0)	(1.3)
Operating Segments | Public
Segment Reporting Information [Line Items]
Net sales	1,724.7	1,812.8
Operating income (loss)	126.0	127.5
Depreciation and amortization expense	(13.4)	(16.2)
Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	631.2	675.2
Operating income (loss)	25.3	36.5
Depreciation and amortization expense	(7.1)	(7.8)
Headquarters
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Operating income (loss)	(47.8)	(43.5)
Depreciation and amortization expense	$ (26.0)	$ (22.6)