| Estimated Future Amortization Expense (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 
|---|---|
| Dec. 31, 2011 | |
| Expected Amortization Expense [Line Items] | |
| 2012 | $ 85.9 | 
| 2013 | 68.3 | 
| 2014 | 56.0 | 
| 2015 | 51.7 | 
| 2016 | 38.9 | 
| Thereafter | 249.4 | 
| Finite-Lived Intangible Assets, Future Amortization Expense, Total | $ 550.2 | 
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- Definition The aggregate estimated amortization expense for succeeding fiscal years for intangible assets subject to amortization. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The amount of amortization expense expected to be recognized for the remainder of the finite-lived intangible asset useful life after the fifth succeeding fiscal year. No definition available. 
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- Definition The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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