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Acquisitions - Narrative (Details) $ in Millions		12 Months Ended
	Dec. 01, 2021 USD ($) coworker	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 30, 2021 USD ($)	Mar. 15, 2021 USD ($)
Business Acquisition [Line Items]
Net sales		$ 20,820.8	$ 18,467.5	$ 18,032.4
Net income		988.6	$ 788.5	$ 736.8
Sirius Computer Solutions, Inc.
Business Acquisition [Line Items]
Total preliminary purchase price	$ 2,418.3
Number of coworkers | coworker	2,600
Net sales		197.0
Net income		$ 9.0
Goodwill, expected tax deductible amount	$ 160.0
Intangible assets, net	1,140.5
Sirius Computer Solutions, Inc. | Senior Notes
Business Acquisition [Line Items]
Proceeds from issuance of unsecured debt	2,500.0
Sirius Computer Solutions, Inc. | Selling and administrative expenses
Business Acquisition [Line Items]
Transaction costs	$ 35.0
Focal Point Data Risk LLC | Customer relationships
Business Acquisition [Line Items]
Intangible assets, net					$ 36.0
Amplified IT LLC | Customer relationships
Business Acquisition [Line Items]
Intangible assets, net						$ 88.0

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