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Stockholders' Equity and Share-Based Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchase program, authorized amount |  | $ 3,600.0 |  |
Restricted stock units expected to vest in February 2022 |  | 1,300,000 |  |
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value |  | $ 0.4 | $ 1.0 | $ 5.5
Granted, weighted-average grant date fair value (per share) |  | $ 17 | $ 29 | $ 47
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, total fair value |  | $ 18.0 | $ 31.7 | $ 67.6
Employee service share based compensation expense (benefit) |  | 5.0 |  |
Excess tax benefits related to stock-based compensation |  | $ (14.1) | $ (5.8) | $ 5.9
Dividends per share (in USD per share) |  | $ 0.92 | $ 0.92 | $ 0.88
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 3 years |  |
Performance Based Restricted Stock Units RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 3 years |  |
Compensation expense, net benefit |  | $ 5.2 |  |
Share-based awards vesting terms |  | 125.00% |  |
Share based compensation arrangement by share based payment award performance share unit award number (in shares) |  | 1,500,000 |  |
Aggregate grant date fair value |  | $ 25.5 |  |
Time Based RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based compensation arrangement by share based payment award performance share unit award number (in shares) |  | 1,500,000 |  |
Aggregate grant date fair value |  | $ 26.1 |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Non-option equity instruments, granted | 45,724 |  |  |
Minimum | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards contractual term, years |  | 10 years |  |
Minimum | Performance Based Restricted Stock Units RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 1 year |  |
Minimum | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 1 year |  |
Maximum | Performance Based Restricted Stock Units RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 3 years |  |
Maximum | Stock-Price Based RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 3 years |  |
Maximum | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 3 years |  |
2013 Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards available for grant (in shares) |  | 31,000,000 |  |
Share-based awards vesting period |  | 3 years | 3 years |
2013 Stock Plan | Minimum | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based awards vesting period |  | 1 year | 1 year |
Chief Executive Officer | Performance Based Restricted Stock Units RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units expected to vest in February 2022 |  | 1,300,000 |  |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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