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Acquisition - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
 9 Months Ended
Jul. 15, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Acquisition Date [Line Items]        
Goodwill   $ 1,226.2 $ 1,066.4 $ 1,058.5
Total purchase price, net of cash and cash equivalents acquired   $ 268.4    
Photon Control Inc [Member]        
Acquisition Date [Line Items]        
Current assets $ 51.4      
Intangible assets 121.0      
Goodwill 168.2      
Other non-current assets 8.6      
Total assets acquired 349.2      
Current liabilities 13.7      
Non-current deferred taxes 32.1      
Other long-term liabilities 0.7      
Total liabilities assumed 46.5      
Fair value of assets acquired and liabilities assumed 302.7      
Less: Cash and cash equivalents acquired (34.3)      
Total purchase price, net of cash and cash equivalents acquired $ 268.4