Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 834.9	$ 816.1	$ 2,618.6	$ 2,456.8
U S
Segment Reporting Information [Line Items]
Revenues	482.1	449.1	1,527.8	1,335.8
International Regions [Member]
Segment Reporting Information [Line Items]
Revenues	352.8	367.0	1,090.8	1,121.0
International Regions [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenues	215.4	231.4	660.4	715.3
International Regions [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	85.5	79.3	270.8	237.8
International Regions [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenues	$ 51.9	$ 56.3	$ 159.6	$ 167.9