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Stockholders' Equity and Share-Based Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2019 | Jun. 11, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Dividends per share |  |  | $ 0.23 | $ 0.23
Deferred Compensation Arrangement with Individual, Description | Mr. Polk agreed to a customary release and restrictive covenants Pursuant to certain terms and conditions Mr. Polk’s unexercised 2011 stock options will remain exercisable until expiration in July 2021 consistent with the terms of the underlying option agreement. Additionally, Mr. Polk’s unvested performance-based RSU awarded in February 2018 will continue to vest in February 2021 (subject to the satisfaction of applicable performance conditions) and a pro-rata portion of the RSUs awarded to Mr. Polk in February 2019, reflecting four months of service and totaling 45,724 RSUs, will continue to vest in February 2022 |  |  |
Employee share based compensation recorded benefit |  |  | $ 9.3 |
Employee share based compensation not yet recognized |  |  | 4.3 |
Share Repurchase Program [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchase remaining amount |  |  | 2,100.0 |
Increase in authorized amount |  | $ 2,500.0 |  |
Stock repurchase program, authorized amount |  |  | 3,600.0 |
Stock Options [Member] | Discontinued Operations [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate grant date fair value |  |  | $ 0.0 |
Number of stock units awarded |  |  | 21,700,000 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of stock units awarded | 45,724 |  |  |
Time-Based RSU's [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  |  | 3 years |
Aggregate grant date fair value |  |  | $ 21.7 |
Number of stock units awarded |  |  | 1,200,000 |
Share-based awards vesting terms |  |  | vest in equal installments over a three-year period. |
Performance Based Restricted Stock Units Rsu [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  |  | 3 years |
Share based compensation arrangement by share based payment award performance share unit award number |  |  | 1,300,000 |
Aggregate grant date fair value |  |  | $ 23.0 |

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- Definition Description of the deferred compensation arrangement, including fixed amounts and determinable awards, or the method for determining payments and awards, the timing of such payments and awards, and any requisite service or performance criteria, as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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