Cost-Reduction Actions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	$ 13.2	$ 0.2	$ 48.6	$ 5.4
Charges (credits) related to work-force reductions	0.7		6.2
Cost of revenue | Services
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	2.9	(1.9)	15.7	(6.6)
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	10.8	2.1	14.8	10.7
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	0.1		0.3	1.3
Other expense, net
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	(0.6)		17.8
Employee severance
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs			14.0
Charges (credits) related to work-force reductions	2.7		14.0
Changes in estimates
Restructuring Cost and Reserve [Line Items]
Charges (credits) related to work-force reductions	(2.0)	(0.5)	(7.8)	0.4
Net foreign currency (gains) losses
Restructuring Cost and Reserve [Line Items]
Other charges (credits) related to the cost-reduction effort	(0.6)		17.8
Asset impairments
Restructuring Cost and Reserve [Line Items]
Other charges (credits) related to the cost-reduction effort	7.5		19.0
Other expenses
Restructuring Cost and Reserve [Line Items]
Other charges (credits) related to the cost-reduction effort	$ 5.6		$ 5.6
Lease abandonment costs and asset write-offs
Restructuring Cost and Reserve [Line Items]
Other charges (credits) related to the cost-reduction effort		$ 0.7		$ 5.0