Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Detail)

v2.4.0.8
Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Reacquired Rights [Member]
Jun. 30, 2013
Reacquired Rights [Member]
Goodwill and Intangible Assets Disclosure [Line Items]              
Amortization expense related to purchased intangible assets $ 33.9 $ 21.5 $ 90.4 $ 64.8   $ 9.7 $ 6.5
Intangible assets, gross 1,375.6   1,375.6   1,538.0 73.3  
Intangible asset, useful life           5 years 7 months 6 days  
Increase in goodwill 85.5            
Reduction in indefinite-lived intangible $ (158.8)