Restructuring - Additional Information (Detail) - 2019 Restructuring Plan [Member] - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2019	Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charges		$ 375.0
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charges	$ 350.0
Reduction in annual pre-tax operating expenses	$ 200.0
Restructuring program benefits realized period	2023
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Pre-tax restructuring charges	$ 400.0
Reduction in annual pre-tax operating expenses	$ 300.0