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Goodwill and Intangible Assets (Narrative) (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of Reporting Units | segment | 7 |  |
Intangible Assets, Net (Excluding Goodwill) | $ 503.0 | $ 520.3 | $ 505.1
Intangibles with indefinite useful lives | 71.0 | $ 70.9 |
I&S (acquisition) |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill, Purchase Accounting Adjustments | $ (0.1) |  |

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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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