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Basis of Presentation and Summary of Significant Accounting Policies - Components of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Abstract]    
Land $ 38.2 $ 47.8
Buildings 361.0 379.5
Machinery and equipment 1,703.1 1,702.0
Property, plant and equipment, gross 2,102.3 2,129.3
Accumulated depreciation (1,663.5) (1,629.9)
Total $ 438.8 $ 499.4