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Earnings and Dividends from Investment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Investments in and Advances to Affiliates, Schedule of Investments [Abstract] |  |  |  |
Earnings from equity method investments | $ 2.1 | $ 3.1 | $ 6.7 | $ 10.2
Dividends received from equity method investments | $ 1.3 | $ 0.5 | $ 7.6 | $ 9.0

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