Consolidated Revenue Information by Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue	$ 779.2	$ 705.5	$ 756.0	$ 731.8	$ 754.2	$ 688.5	$ 640.8	$ 646.8	$ 2,972.5	$ 2,730.3	$ 2,280.7
Long-lived assets at December 31	1,165.1				1,170.7				1,165.1	1,170.7	1,223.3
United States
Segment Reporting Information [Line Items]
Revenue									1,626.5	1,472.4	1,177.0
Long-lived assets at December 31	547.1				498.4				547.1	498.4	495.8
International
Segment Reporting Information [Line Items]
Revenue									1,346.0	1,257.9	1,103.7
Long-lived assets at December 31	618.0				672.3				618.0	672.3	727.5
International | EMEA
Segment Reporting Information [Line Items]
Revenue									862.8	800.2	708.4
International | Americas [Member]
Segment Reporting Information [Line Items]
Revenue									197.1	191.2	162.3
International | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue									$ 286.1	$ 266.5	$ 233.0