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Goodwill and Intangible Assets - Summary of Goodwill by Operating Segment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 2,114.2	$ 2,110.0	$ 1,383.3
Accumulated Impairment Losses	(450.8)	(450.8)	(450.8)
Carrying Value	1,663.4	1,659.2	932.5
ASG
Goodwill [Line Items]
Goodwill	1,566.3	1,563.4	836.7
Accumulated Impairment Losses	(418.9)	(418.9)	(418.9)
Carrying Value	1,147.4	1,144.5	417.8
ISG
Goodwill [Line Items]
Goodwill	114.7	114.4	114.4
Accumulated Impairment Losses	0.0	0.0	0.0
Carrying Value	114.7	114.4	114.4
PSG
Goodwill [Line Items]
Goodwill	433.2	432.2	432.2
Accumulated Impairment Losses	(31.9)	(31.9)	(31.9)
Carrying Value	$ 401.3	$ 400.3	$ 400.3

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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
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