Segment and Geographic Area Information - Schedule of Corporate Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 288.8	$ 191.9
Deferred income tax assets, net of valuation allowances	78.5	57.8
Property, plant and equipment, net	438.8	499.4
Total assets	3,130.9	3,330.1
Corporate
Segment Reporting Information [Line Items]
Cash and cash equivalents	(10.9)	(47.6)	$ (31.8)
Deferred income tax assets, net of valuation allowances	43.9	29.4	37.1
Software, net	34.7	43.8	42.6
Deferred compensation plan and Company owned life insurance assets	0.2	93.9	89.3
Property, plant and equipment, net	28.6	32.2	32.1
Other	139.2	101.4	35.1
Total assets	$ 235.7	$ 253.1	$ 204.4