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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,599.0 | $ 1,584.5 | $ 1,563.4 | $ 1,412.7 | $ 1,385.0 | $ 1,482.3 | $ 1,427.1 | $ 1,300.4 | $ 6,159.6 | $ 5,594.8 | $ 5,392.4
Total expenses | 1,516.9 | 1,487.8 | 1,416.4 | 1,360.4 | 1,316.2 | 1,387.4 | 1,289.6 | 1,244.7 |  |  |
Earnings before income taxes | 82.1 | 96.7 | 147.0 | 52.3 | 68.8 | 94.9 | 137.5 | 55.7 | 378.1 | 356.9 | 293.5
Net earnings attributable to controlling interests | $ 105.1 | $ 130.4 | $ 171.9 | $ 55.7 | $ 95.1 | $ 122.8 | $ 150.0 | $ 46.5 | $ 463.1 | $ 414.4 | $ 356.8
Basic net earnings per share | $ 0.58 | $ 0.72 | $ 0.96 | $ 0.31 | $ 0.53 | $ 0.69 | $ 0.85 | $ 0.26 |  |  |
Diluted net earnings per share | $ 0.57 | $ 0.71 | $ 0.95 | $ 0.31 | $ 0.53 | $ 0.69 | $ 0.84 | $ 0.26 |  |  |

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