Goodwill and Other Intangibles - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 01, 2012
Business Acquisition [Line Items]
Percentage of ownership acquired				100.00%
Total cash consideration paid, including payment for acquired cash, subject to customary adjustments				$ 713.5
Identifiable intangible assets				510.7
Net liabilities assumed				49.4
Goodwill relating to acquisition				252.2
Integration costs for acquisition	18
Transaction costs for acquisition	6
Nonamortizable identifiable intangible assets acquired				495.0
Amortizable identifiable intangible assets acquired				15.7
Nonamortizable intangible assets	113
Impairment charges for amortizable intangible assets			$ 8