Cost Reduction Actions - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) Employee	Sep. 30, 2015 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Estimated pretax restructuring charge	$ 300.0	$ 17.4	$ 70.0
Work-force reduction charges		9.8	52.3
Asset impairments and other expenses related to the cost reduction effort		7.6	17.7
Cost of Revenue | Technology
Restructuring Cost and Reserve [Line Items]
Estimated pretax restructuring charge		0.1	0.2
Cost of Revenue | Services
Restructuring Cost and Reserve [Line Items]
Estimated pretax restructuring charge		7.9	21.2
Selling, General and Administrative
Restructuring Cost and Reserve [Line Items]
Estimated pretax restructuring charge		8.6	36.1
Research and Development
Restructuring Cost and Reserve [Line Items]
Estimated pretax restructuring charge		0.8	12.5
United States
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 2.7	$ 28.1
Number of employees | Employee		176	706
Non-US
Restructuring Cost and Reserve [Line Items]
Severance costs		$ 7.1	$ 24.2
Number of employees | Employee		114	527