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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 4,365.7	$ 4,629.9	$ 8,754.9	$ 8,587.8
Income (loss) from operations	283.4	300.3	529.2	529.2
Depreciation and amortization expense	(125.2)	(65.0)	(216.6)	(129.3)
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Net sales	1,557.5	1,883.9	3,468.5	3,620.1
Income (loss) from operations	123.0	157.2	250.4	291.9
Depreciation and amortization expense	(22.1)	(21.6)	(44.4)	(43.1)
Operating Segments | Small Business
Segment Reporting Information [Line Items]
Net sales	302.1	377.4	693.6	733.0
Income (loss) from operations	21.0	26.6	48.3	51.0
Depreciation and amortization expense	(5.6)	(5.6)	(11.4)	(11.2)
Operating Segments | Public
Segment Reporting Information [Line Items]
Net sales	2,022.1	1,840.1	3,547.4	3,170.8
Income (loss) from operations	159.9	129.4	272.3	205.5
Depreciation and amortization expense	(69.1)	(13.7)	(106.8)	(26.4)
Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	484.0	528.5	1,045.4	1,063.9
Income (loss) from operations	16.5	19.1	31.2	44.7
Depreciation and amortization expense	(7.9)	(7.8)	(15.9)	(15.2)
Headquarters
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Income (loss) from operations	(37.0)	(32.0)	(73.0)	(63.9)
Depreciation and amortization expense	$ (20.5)	$ (16.3)	$ (38.1)	$ (33.4)

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