Segment Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
United States
Minimum percentage of revenue accounted	10.00%	10.00%
Long-lived assets, excluding financial instruments, deferred tax assets, goodwill and intangible assets		$ 3,631.2	$ 3,622.8
Minimum percentage of Assets accounted	10.00%		10.00%
International Segment
Long-lived assets, excluding financial instruments and deferred tax assets	$ 583.6		$ 616.5