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Business Acquisitions - Narrative (Detail) - Drum Parent, Inc. - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 27, 2021
Sep. 30, 2021
Sep. 30, 2021
Business Acquisition [Line Items]      
Gross contractual receivable $ 81.0    
Contractual receivables deemed uncollectible 12.0    
Incurred and expensed acquisition costs 14.0    
Acquisition-related costs   $ 13.2 $ 14.0
Goodwill tax-deductible amount 76.0    
Centuri      
Business Acquisition [Line Items]      
Payments to acquire business $ 830.4