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Goodwill and Other Intangible Assets - Amortization Expense of Other Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Estimated Future Amortization Expense Related to Intangible Assets, Fiscal Year Maturity [Abstract]  
2013 $ 47.2
2014 42.6
2015 39.9
2016 38.0
2017 36.5
Thereafter 115.0
Intangible Assets, Net Carrying Amount $ 319.2