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Goodwill and Intangible Assets (Narrative) (Detail) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of Reporting Units | segment | 7 |  |
Adjustments to purchase price allocations | $ (0.1) |  |
Intangible Assets, Net (Excluding Goodwill) | 478.7 | $ 519.1 | $ 503.7
Intangibles with indefinite useful lives | 70.8 | $ 70.9 |
I&S (acquisition) |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Adjustments to purchase price allocations | $ (0.1) |  |

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