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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2021	Jan. 01, 2020	Jan. 31, 2019
Stock Repurchase Programs [Line Items]
Cumulative repurchases, shares	10.9	1.5	32.5	21.6	2.0	1,000.0
Cumulative repurchases, value		$ 88.5	$ 1,323.0	$ 823.5	$ 600.0
Common stock average price	$ 45.89	$ 58.33	$ 40.68	$ 38.06
Maximum
Stock Repurchase Programs [Line Items]
Cumulative repurchases, value							$ 500.0

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- Definition

Stock Repurchase Programs [Line Items]

+ References

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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