Annual purchase of stock per employee under a share based compensation plan.

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Base wages subject to withholding towards stock purchase under a share based compensation plan.

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Number Of Offering Periods

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The percentage of base wages withheld for the purchase of stock under a share based compensation plan.

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Share-Based Compensation Arrangement By Share-Based Payment Award, Additional Number Of Shares Authorized

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Share-Based Compensation Arrangement By Share-Based Payment Award, Cash Contributions To ESPP

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Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Installments Over First Two Anniversaries

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- Definition

Amount of increase (decrease) to additional paid-in capital (APIC) for recognition and exercise of award under share-based payment arrangement.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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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

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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.

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No definition available.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Equity Compensation Plans - Narrative (Details)		12 Months Ended
Equity Compensation Plans - Narrative (Details)	May 19, 2019 installment shares	Dec. 31, 2019 USD ($) offering_period shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	May 01, 2019 shares	Apr. 27, 2017 shares	Dec. 16, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)		6 years 3 months 18 days		4 years 9 months 18 days
Share-based compensation expense \| $		$ 21,300,000	$ 21,500,000	$ 21,000,000.0
Total intrinsic value of stock options exercised \| $			200,000	9,800,000
Additional paid-in-capital recorded \| $			$ 500,000	9,700,000
Total unrecognized compensation cost \| $		$ 7,200,000
Recognition period for unrecognized compensation cost		2 years 10 months 24 days
Cash contributions to ESPP \| $				$ 2,800,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		4,400,000
Vesting period		4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		4,432,000	1,711,000	666,000
Total unrecognized compensation cost \| $		$ 24,900,000
Recognition period for unrecognized compensation cost		2 years 1 month 6 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares remaining available for issuance (in shares)		0
Granted (in shares)		1,239,000
Total unrecognized compensation cost \| $		$ 2,600,000
Recognition period for unrecognized compensation cost		1 year 7 months 6 days
Cash-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	9,700,000
Share-based compensation expense \| $		$ 2,800,000
Vesting period	2 years
Number of installments over first two anniversaries \| installment	2
Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)					12,400,000	8,000,000.0
Additional number of shares authorized (in shares)					4,400,000
Number of shares outstanding (in shares)		2,700,000
Number of shares remaining available for issuance (in shares)		3,300,000
Omnibus Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding (in shares)		4,500,000
Omnibus Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding (in shares)		1,000,000.0
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							7,500,000
Number of shares outstanding (in shares)		2,100,000
2014 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs outstanding (in shares)		33,200,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		2,000,000.0
Number of shares remaining available for issuance (in shares)		1,900,000
Share-based compensation expense \| $		$ 1,300,000		$ 1,100,000
Number of offering periods \| offering_period		2
Maximum annual purchases per employee under ESPP \| $		$ 25,000
Discount from market price at the beginning or end of the offering period		15.00%
Maximum annual withholdings per employee for purchases under ESPP \| $		$ 21,250
Maximum number of shares available for purchase per employee (in shares)		15,000
Shares issued under plan (in shares)		100,000
ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of base wages withheld for purchase of stock		1.00%
ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of base wages withheld for purchase of stock		15.00%
Share-based Payment Arrangement, Tranche One \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage		25.00%
Share-based Payment Arrangement, Tranche One \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		1,000,000.0
Vesting period		2 years
Share-based Payment Arrangement, Tranche Two \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage		25.00%
Share-based Payment Arrangement, Tranche Two \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		200,000
Share-based Payment Arrangement, Tranche Three \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage		25.00%
Share-Based Compensation Award, Tranche Four \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage		25.00%
Prospective Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)		400,000
Prospective Employee \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		500,000
Prospective Employee \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		300,000
Employee \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		2,400,000
Employees And Executives \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		1,000,000.0
Executive New Hires \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		500,000
Chief Executive Officer \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		500,000