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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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