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Restructuring and Other - Schedule of Company's Restructuring Activity (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring And Related Activities [Abstract]    
Beginning of period $ 0.3 $ 3.7
Restructuring charges 2.8 0.2
Payments and adjustments (1.1) (1.0)
End of period $ 2.0 $ 2.9