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Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 4,382.9	$ 2,595.9
Foreign currency translation	(34.4)	(2.1)
Ending balance	4,342.7	4,382.9
Corporate
Goodwill [Roll Forward]
Beginning balance	2,024.4	1,123.6
Foreign currency translation	0.0	0.0
Ending balance	2,133.4	2,024.4
Accumulated impairment losses	1,571.0
Small Business
Goodwill [Roll Forward]
Beginning balance	266.1	185.9
Foreign currency translation	0.0	0.0
Ending balance	230.2	266.1
Public
Goodwill [Roll Forward]
Beginning balance	1,737.7	929.6
Foreign currency translation	0.0	0.0
Ending balance	1,658.8	1,737.7
Accumulated impairment losses	354.0
Other
Goodwill [Roll Forward]
Beginning balance	354.7	356.8
Foreign currency translation	(34.4)	(2.1)
Ending balance	320.3	354.7
Accumulated impairment losses	28.0
Amplified IT LLC
Goodwill [Roll Forward]
Acquisition		133.8
Amplified IT LLC | Corporate
Goodwill [Roll Forward]
Acquisition		0.0
Amplified IT LLC | Small Business
Goodwill [Roll Forward]
Acquisition		0.0
Amplified IT LLC | Public
Goodwill [Roll Forward]
Acquisition		133.8
Amplified IT LLC | Other
Goodwill [Roll Forward]
Acquisition		0.0
Focal Point Data Risk LLC
Goodwill [Roll Forward]
Acquisition		82.7
Focal Point Data Risk LLC | Corporate
Goodwill [Roll Forward]
Acquisition		0.0
Focal Point Data Risk LLC | Small Business
Goodwill [Roll Forward]
Acquisition		0.0
Focal Point Data Risk LLC | Public
Goodwill [Roll Forward]
Acquisition		82.7
Focal Point Data Risk LLC | Other
Goodwill [Roll Forward]
Acquisition		0.0
Sirius Computer Solutions, Inc.
Goodwill [Roll Forward]
Acquisition		1,572.4
Sirius Computer Solutions, Inc. | Corporate
Goodwill [Roll Forward]
Acquisition		900.6
Sirius Computer Solutions, Inc. | Small Business
Goodwill [Roll Forward]
Acquisition		80.2
Sirius Computer Solutions, Inc. | Public
Goodwill [Roll Forward]
Acquisition		591.6
Sirius Computer Solutions, Inc. | Other
Goodwill [Roll Forward]
Acquisition		0.0
Other acquisition adjustments
Goodwill [Roll Forward]
Acquisition		0.2
Sirius measurement period adjustment	(5.8)
Other acquisition adjustments | Corporate
Goodwill [Roll Forward]
Acquisition		0.2
Sirius measurement period adjustment	109.0
Other acquisition adjustments | Small Business
Goodwill [Roll Forward]
Acquisition		0.0
Sirius measurement period adjustment	(35.9)
Other acquisition adjustments | Public
Goodwill [Roll Forward]
Acquisition		0.0
Sirius measurement period adjustment	(78.9)
Other acquisition adjustments | Other
Goodwill [Roll Forward]
Acquisition		$ 0.0
Sirius measurement period adjustment	$ 0.0

X

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