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Quarterly Operating Results (unaudited) - Quarterly Operating Results (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,721.4 | $ 1,825.2 | $ 1,657.8 | $ 1,990.6 | $ 1,657.4 | $ 1,778.5 | $ 1,660.4 | $ 1,837.7 |  |  |  |
Total expenses | 1,637.4 | 1,710.4 | 1,552.3 | 1,668.8 | 1,614.2 | 1,688.2 | 1,556.8 | 1,595.4 |  |  |  |
Earnings before income taxes | 84.0 | 114.8 | 105.5 | 321.8 | 43.2 | 90.3 | 103.6 | 242.3 | $ 626.1 | $ 479.4 | $ 359.8 |
Net earnings attributable to controlling interests | $ 98.5 | $ 126.1 | $ 110.1 | $ 334.1 | $ 117.3 | $ 127.6 | $ 114.9 | $ 273.7 | $ 668.8 | $ 633.5 | $ 481.3 | [1]
Basic net earnings per share | $ 0.53 | $ 0.68 | $ 0.59 | $ 1.81 | $ 0.64 | $ 0.70 | $ 0.63 | $ 1.51 |  |  |  |
Diluted net earnings per share | $ 0.51 | $ 0.66 | $ 0.58 | $ 1.77 | $ 0.63 | $ 0.68 | $ 0.62 | $ 1.48 |  |  |  |
[1] | See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.

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