Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 883.4	$ 835.4
Less: accumulated depreciation	599.1	593.5
Property, plant and equipment, net	284.3	241.9
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	12.3	11.9
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	120.2	113.3
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	397.8	396.2
Furniture and Fixtures, Office Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	187.1	186.7
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	95.4	80.4
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 70.6	$ 46.9