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Other Income, Net - Schedule of Components of Other Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Securities earnings: |  |  |  |  |  |  |  |
Dividends and interest |  |  |  |  |  | $ 4.8 | $ 10.9 | $ 26.1
Securities transactions, net |  |  |  |  |  | (0.1) | 0.3 | 12.4
Total |  |  |  |  |  | 4.7 | 11.2 | 38.5
Gain on land sales | $ 4.0 |  |  | $ 4.4 |  | 4.5 | 4.4 | 12.5
Gain on sale of business |  |  | $ 3.0 |  |  | 4.9 | 3.0 | 58.4
Insurance recoveries |  |  |  |  | $ 7.7 | 1.6 | 7.7 | 1.3
Currency transactions, net |  |  |  |  |  | (4.0) | 2.0 | 10.1
Disposal of property and equipment, net |  |  |  |  |  | (0.2) | (0.3) | (0.3)
Infrastructure reimbursement |  | $ 19.1 |  |  | $ 8.8 | 19.7 | 9.2 | 4.3
Other, net |  |  |  |  |  | 2.1 | 3.7 | 2.8
Total |  |  |  |  |  | $ 28.4 | $ 40.9 | $ 69.2

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