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Goodwill - Schedule of Goodwill by Segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 2,595.9
Foreign currency translation	(3.6)
Ending balance	2,804.6
Corporate
Goodwill [Roll Forward]
Beginning balance	1,123.6
Foreign currency translation	0.0
Ending balance	1,123.8
Accumulated impairment losses	1,571.0
Small Business
Goodwill [Roll Forward]
Beginning balance	185.9
Foreign currency translation	0.0
Ending balance	185.9
Public
Goodwill [Roll Forward]
Beginning balance	929.6
Foreign currency translation	0.0
Ending balance	1,141.7
Accumulated impairment losses	354.0
Other
Goodwill [Roll Forward]
Beginning balance	356.8
Foreign currency translation	(3.6)
Ending balance	353.2
Accumulated impairment losses	28.0
Amplified IT
Goodwill [Roll Forward]
Acquisition	130.3
Amplified IT | Corporate
Goodwill [Roll Forward]
Acquisition	0.0
Amplified IT | Small Business
Goodwill [Roll Forward]
Acquisition	0.0
Amplified IT | Public
Goodwill [Roll Forward]
Acquisition	130.3
Amplified IT | Other
Goodwill [Roll Forward]
Acquisition	0.0
Focal Point
Goodwill [Roll Forward]
Acquisition	81.8
Focal Point | Corporate
Goodwill [Roll Forward]
Acquisition	0.0
Focal Point | Small Business
Goodwill [Roll Forward]
Acquisition	0.0
Focal Point | Public
Goodwill [Roll Forward]
Acquisition	81.8
Focal Point | Other
Goodwill [Roll Forward]
Acquisition	0.0
Other Acquisition
Goodwill [Roll Forward]
Acquisition	0.2
Other Acquisition | Corporate
Goodwill [Roll Forward]
Acquisition	0.2
Other Acquisition | Small Business
Goodwill [Roll Forward]
Acquisition	0.0
Other Acquisition | Public
Goodwill [Roll Forward]
Acquisition	0.0
Other Acquisition | Other
Goodwill [Roll Forward]
Acquisition	$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

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+ References

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Name Accounting Standards Codification
-Topic 350
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