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Earnings and Dividends from Equity Method of Investment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Earnings from equity method investments $ 2.0 $ 2.3 $ 3.9 $ 4.6
Dividends received from equity method investments $ 5.2 $ 0.2 $ 5.6 $ 1.6