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Per Share Information (Detail) - shares shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Weighted average shares outstanding attributable to participating securities (in shares) | 2.6 | 2.3 | 2.5 | 2.5

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