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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

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- References

No definition available.

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- Definition

The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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No definition available.

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