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Summary of Transaction with Affiliates and Other Related Parties (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transactions [Abstract]      
Sales to affiliates $ 145.1 $ 93.1 $ 96.2
Purchases from affiliates 41.5 141.9 134.0
Management and other fees for services provided to affiliates 22.3 23.0 13.8
Dividends received from affiliates $ 17.6 $ 14.4 $ 43.6