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Investments in Affiliated Companies (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Investments in and Advances to Affiliates [Line Items]      
Unrealized Gain (Loss) on Securities $ (5.3)    
Equity method investments   $ 42.4 $ 49.0
Cost method Investments   89.9 84.7
Total investments in affiliated companies   $ 132.3 $ 133.7