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Investments in Affiliated Companies (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]    
Equity Method investments $ 44.0 $ 46.1
Cost Method investments 124.3 92.7
Total investments in affiliated companies (Note 4) $ 168.3 $ 138.8