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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 |

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