Revenues by Geographic Area Based on Destination (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, Asset Reconciling Item [Line Items]
Revenues	$ 903.1	$ 888.1	$ 850.3	$ 842.2	$ 803.2	$ 766.7	$ 768.1	$ 747.3	$ 3,483.7	$ 3,085.3	$ 2,499.8
% of Revenues									100.00%	100.00%	100.00%
UNITED STATES
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues									1,533.3	1,499.5	1,296.4
% of Revenues									44.00%	48.60%	51.90%
Europe
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues									894.0	755.9	606.0
% of Revenues									25.70%	24.50%	24.20%
Asia, Pacific Rim, Middle East and other
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues									$ 1,056.4	$ 829.9	$ 597.4
% of Revenues									30.30%	26.90%	23.90%