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Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule Of Other Intangible Assets [Line Items]        
Goodwill impairment non-cash charges     $ 18.0  
Impairment of intangible assets $ 2.3   2.3  
Additions to other intangible assets     106.5  
Amortization expense for other intangible assets 20.4 $ 19.9 58.6 $ 58.7
International        
Schedule Of Other Intangible Assets [Line Items]        
Goodwill impairment non-cash charges 18.0   $ 18.0  
Impairment of intangible assets $ 2.3