Intangible Assets - Major Classes of Amortizable Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
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Finite-Lived Intangible Assets [Line Items] | |||
Amortizable intangible assets, net | $ 1,078.8 | $ 809.6 | $ 561.5 |
Expiration Lists [Member]
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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]
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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]
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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 |