Segment and Geographic Area Information - Schedule of Corporate Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 190.8	$ 370.6
Deferred income tax assets, net of valuation allowances	199.2	162.9
Property, plant and equipment, net	500.0	531.3
Total assets	3,330.1	3,640.8
Corporate
Segment Reporting Information [Line Items]
Cash and cash equivalents	(47.6)	(31.8)	$ (37.5)
Deferred income tax assets, net of valuation allowances	29.4	37.1	36.7
Software, net	48.0	49.0	41.6
Deferred compensation plan and Company owned life insurance assets	93.9	89.3	88.6
Property, plant and equipment, net	32.3	32.3	29.6
Other	96.3	25.8	39.0
Total assets	$ 252.3	$ 201.7	$ 198.0