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Investments in Affiliated Companies (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Investments in and Advances to Affiliates [Line Items]      
Equity method investments $ 40.3   $ 49.0
Cost method Investments 89.7   84.7
Total investments in affiliated companies 130.0   $ 133.7
Unrealized Gain on Securities 2.5 $ 31.2  
Unrealized Loss on Securities $ 4.8 $ 8.6