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Earnings and Dividends from Investment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]        
Earnings from equity method investments $ 2.0 $ 2.0 $ 3.7 $ 3.9
Dividends received from equity method investments 0.3 5.2 0.5 5.6
Dividends or Distributions Cost Method Investment $ 0.7 $ 0.6 $ 0.7 $ 0.6