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Earnings Per Share and Weighted-Average Shares Outstanding - Calculation of Basic Earnings Per Share (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Reduction for dividends on preferred stock or units | $ 3.2 | $ 0.2 | $ 6.4 | $ 0.2

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- References No definition available. + Details
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- Definition The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. + References No definition available. + Details
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