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Goodwill and Intangible Assets -Additional Information (Detail) - USD ($)
$ in Millions
7 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill impairment charges     $ 652.0
Intangible assets acquired $ 10.4 $ 42.5  
Amortization expense 189.9 $ 191.2 188.8
Intangible asset impairment charges     $ 580.0
Sales [Member]      
Goodwill [Line Items]      
Goodwill impairment charges $ 652.0