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Share-Based Compensation - Narrative (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 15, 2012 | Feb. 17, 2000 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 17, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total Intrinsic value of stock options exercised |  |  | $ 3,900,000 |  |  |
Cash received from exercise of stock options |  |  | 1,700,000 | $ 5,700,000 | $ 18,000,000.0 |
Proceeds for the issuance of common stock under the ESPP |  |  | $ 26,200,000 | $ 25,000,000.0 | $ 23,600,000 |
Employee stock options granted in period |  |  | 0 | 0 | 0 |
Period after termination in which options can be exercised (in days) | 90 days |  |  |  |  |
Period after termination in which options can be exercised in case of death or disability (in years) | 1 year |  |  |  |  |
Number of options vested and expected to vest (in shares) |  |  |  | 300,000 |  |
Weighted average exercise price of options vested and expected to vest (in dollars per share) |  |  | $ 8.19 | $ 6.41 |  |
Stock option exercises (in shares) |  |  | 300,000 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price |  |  | $ 6.37 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  |  | $ 200,000 |  |  |
Share-based compensation expense |  |  | $ 79,400,000 | $ 78,300,000 | $ 69,800,000 |
Amended And Restated Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance under the plan (in shares) | 33,000,000.0 |  |  |  |  | 27,900,000
Common stock reserved and available for grant (in shares) |  |  |  |  |  | 87,000,000.0
Aggregate of common stock available for grant (in shares) |  |  | 25,500,000 |  |  |
Amended And Restated Stock Incentive Plan | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |
Term of grant agreement (in years) | 7 years |  |  |  |  |
Amended And Restated Stock Incentive Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 4 years |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash received from exercise of stock options |  |  | $ 1,700,000 |  |  |
Proceeds for the issuance of common stock under the ESPP |  |  | 26,200,000 |  |  |
Time Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  | 74,900,000 |  |  |
Compensation expense recognized on restricted stock units |  |  | $ 48,400,000 |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Recognition period for compensation expense (in years) |  |  | 1 year 3 months 18 days |  |  |
Aggregate of common stock available for grant (in shares) |  |  | 4,800,000 |  |  |
Restricted Stock | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity awards granted in period (in shares) |  |  | 100,000 |  |  |
Weighted average grant date fair value (In dollars per share) |  |  | $ 18.08 |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate of common stock available for grant (in shares) |  |  |  |  |  | 28,500,000
Share-based compensation expense |  |  | $ 7,800,000 |  |  |
Maximum employee subscription rate for the ESPP (as a percent) |  | 10.00% |  |  |  |
Discount rate from market value paid by participants for shares under the plan (as a percent) |  | 85.00% |  |  |  |
Maximum annual amount of purchases per employee under the plan |  | $ 25,000 |  |  |  |
Shares authorized for purchase per employee per quarter (in shares) |  | 500 |  |  |  |
Maximum fair value of shares employee may purchase in a quarter |  | $ 6,250 |  |  |  |
Shares issued pursuant to the employee stock purchase plan (in shares) |  |  | 1,700,000 | 1,500,000 | 1,900,000 |
Employee Stock Purchase Plan | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense |  |  | $ 1,800,000 |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  | $ 60,900,000 |  |  |
Pre-vesting forfeitures (as a percent) |  |  | 5.00% | 5.00% | 5.00% |
Equity awards granted in period (in shares) |  |  | 5,400,000 |  |  |
Compensation expense recognized on restricted stock units |  |  | $ 69,800,000 |  |  |
Weighted average grant date fair value (In dollars per share) |  |  | $ 21.64 |  |  |
Restricted Stock Units | Officers And Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity awards granted in period (in shares) |  |  | 2,600,000 |  |  |
Restricted Stock Units | Amended And Restated Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |
Performance Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  | $ 10,100,000 |  |  |
Market Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized share-based compensation expense on non-vested stock awards |  |  | $ 3,900,000 |  |  |
Option price above closing price of common stock at end of quarter |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 24.38 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=116856206&loc=d3e5070-113901 + Details
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