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Investments in Affiliated Companies (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investments in and Advances to Affiliates [Line Items]          
Other than Temporary Impairment Losses, Investments $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Total equity method investments 48.0   48.0   $ 39.4
Total cost method investments 23.2   23.2   23.2
Total investments in affiliated companies $ 71.2   $ 71.2   $ 62.6