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Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended
	Jun. 30, 2018	Dec. 31, 2016	Mar. 31, 2020
Equity [Abstract]
Stock repurchase program period		3 years
Stock repurchase program, authorized amount		$ 100.0
Authorized increase and extension in stock repurchase program amount	$ 300.0
Stock repurchase program extended expiration date	2020-12
Shares repurchased			9.1
Shares repurchased average price paid per share			$ 36.93
Remaining authorized repurchase amount			$ 74.2

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Stock repurchase program extended expiration date.

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- Definition

Stock repurchase program increase and extension in authorized amount.

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
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Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
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