Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 816.1	$ 865.6
U S
Segment Reporting Information [Line Items]
Revenues	480.0	499.8
International Regions [Member]
Segment Reporting Information [Line Items]
Revenues	336.1	365.8
International Regions [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenues	210.2	227.6
International Regions [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	82.0	86.1
International Regions [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenues	$ 43.9	$ 52.1