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Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Change in Contract with Customer, Liability [Line Items] |  |  |
Long-term deferred revenue | $ 3.5 | $ 5.5 |
Deferred revenue and customer advances | 37.6 |  | $ 31.2
Deferred Revenue [Member] |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |
Deferred revenue and customer advances | 20.0 | 18.4 |
Customer Advances [Member] |  |  |
Change in Contract with Customer, Liability [Line Items] |  |  |
Deferred revenue and customer advances | $ 17.6 | $ 12.8 |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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