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Realignment Costs - Schedule of Accrued Liabilities in Company's Consolidated Balance Sheet Included Amounts Related to Realignment Costs (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Restructuring and Related Activities [Abstract]  
Restructuring reserve, beginning balance $ 0.0
Pre-tax charges 43.9
Utilization (19.0)
Restructuring reserve, ending balance $ 24.9