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Intangible Assets - Major Classes of Amortizable Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, net $ 1,078.8 $ 809.6 $ 561.5
Expiration Lists [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross 1,563.5 1,175.0  
Accumulated amortization (511.3) (390.8)  
Amortizable intangible assets, net 1,052.2 784.2  
Non-Compete Agreements [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross 37.3 30.9  
Accumulated amortization (25.9) (23.3)  
Amortizable intangible assets, net 11.4 7.6  
Trade Names [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross 22.1 23.0  
Accumulated amortization (6.9) (5.2)  
Amortizable intangible assets, net $ 15.2 $ 17.8