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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 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 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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