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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
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