Common Stock, Votes per share

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Compensation Related Costs Share Based Payments Disclosure [Line Items]

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Share based Compensation Arrangement by Share based Payment Award, Maximum Contribution Per Employee

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Discount rate from fair value on purchase 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).

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Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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CAPITAL STOCK AND STOCK AWARD PLANS - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) vote $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	May 31, 2018 shares	May 12, 2016 shares	Dec. 31, 2013 shares
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Preferred stock, authorized (in shares)	20,000,000	20,000,000
Preferred stock, par value (in dollars per share) \| $ / shares	$ 0.10	$ 0.10
Preferred stock, outstanding (in shares)	0	0
Common stock, authorized (in shares)	480,000,000	480,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.10	$ 0.10
Entitled vote for each share of Common Stock (vote) \| vote	1
Stock award, vesting period	5 years
Antidilutive securities excluded from computation of earnings per share (in shares)	5,296
Maximum employee contribution to purchase company stock \| $	$ 10,000
Discount rate used to determine the purchase price	15.00%
2013 and 2018 Share Repurchase Programs
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares remaining for repurchase under authorization (in shares)	13,673,080
2013 Repurchase Program
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Number of shares authorized to be repurchased (in shares)							15,000,000
2018 Repurchase Program
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Number of shares authorized to be repurchased (in shares)					15,000,000
Stock Option
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Maximum shares that can be granted under stock plan (in shares)						13,041,803
Shares available for stock awards (in shares)	1,571,347
Stock award, vesting period	5 years
Unrecognized compensation expense \| $	$ 56,100,000
Performance Shares
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Options issued during period (in shares)	0	0	0	0
Full Value Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock award, vesting period	5 years
Unrecognized compensation expense \| $	$ 120,000,000
Full Value Awards \| Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted shares and restricted units grants, discount for post-vesting holding restrictions (percent)	15.00%
Full Value Awards \| Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted shares and restricted units grants, discount for post-vesting holding restrictions (percent)	21.00%