Employee service share-based compensation estimated tax benefit from compensation expense.

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- Definition

Unrecognized cost of LTIP awards granted.

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Weighted average period over which unrecognized compensation is expected to be recognized for the long-term incentive program, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of Long-term Incentive Program compensation cost.

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Share based compensation arrangement by share based payment award maximum share value authorized for purchase.

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Share based compensation fair value adjustment.

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Share-based Compensation Arrangement by Share-based Payment Award, Full Value Shares To Available Shares, Conversion Ratio

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Stock Repurchase Program, Additional Authorized Amount

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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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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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Purchase price of common stock expressed as a percentage of its fair value.

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

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

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Long-term Incentive Compensation and Shareholders’ Equity - Additional Information (Details)			2 Months Ended	12 Months Ended
	Jul. 01, 2017	Jan. 01, 2017	Feb. 22, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Oct. 10, 2017 USD ($)	Jul. 31, 2016 shares	Jun. 20, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants \| shares									7,500,000
Aggregate intrinsic value of stock awards exercised				$ 34,895,000	$ 73,944,000	$ 117,260,000
Aggregate intrinsic value of stock awards outstanding				117,722,000
Aggregate intrinsic value of stock awards exercisable				25,609,000
Contributions used to purchase stock accumulated through payroll withholdings or through optional lump sum payments				616,116,000	706,564,000
Share-based awards, fair value assumptions, expected dividend				0	0	0
Long-term incentive program (LTIP) expense				61,978,000	64,956,000	123,957,000
Stock-based compensation expense				35,092,000	38,338,000	56,664,000
Estimated tax benefits recorded for stock-based compensation				7,717,000	12,731,000	19,689,000
Unrecognized compensation cost related to outstanding LTIP awards				98,015,000
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans				$ 61,166,000
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years)				1 year 1 month 12 days
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under stock-based component of LTIP costs, weighted average remaining period (in years)				1 year 4 months 12 days
Tax benefits from stock award exercises				$ 13,473,000	28,397,000	45,749,000
Proceeds from stock option exercises				$ 0	$ 0	0
Purchase of treasury stock (in shares) \| shares				12,966,672	16,649,090
Purchase of treasury stock				$ 810,949,000	$ 1,072,377,000	575,380,000
Purchase of treasury stock, average price per share \| $ / shares				$ 62.54	$ 64.41
Stock repurchase program, additional authorized amount							$ 1,252,961,000
Stock repurchase program, number of shares authorized to be repurchased \| shares								247,039,000
Preferred stock, shares authorized (in shares) \| shares				5,000,000	5,000,000
Acquisition of additional ownership interests in several existing majority-owned joint ventures				$ 5,357,000	$ 21,512,000	$ 66,382,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of treasury stock (in shares) \| shares			1,237,800
Purchase of treasury stock			$ 92,790,000
Purchase of treasury stock, average price per share \| $ / shares			$ 74.96
Share repurchase program, available under the current board authorizations for additional share repurchase			$ 1,026,326,000
Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Terms of award (in years)				5 years
Full share awards to shares available, conversion ratio				3.5
Shares available for future grants \| shares				27,369,515
Stock Incentive Plan 2011 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				36 months
Stock Incentive Plan 2011 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				48 months
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance of stock-settled stock appreciation rights (in shares) \| shares				6,648,199	7,337,266
Weighted average fair value \| $ / shares				$ 14.51	$ 13.74	$ 17.97
Stock appreciation rights \| Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance of stock-settled stock appreciation rights (in shares) \| shares				6,648,199
Stock Settled Stock Units \| Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance of stock-settled stock units and cash-settled stock appreciation rights (in shares) \| shares				1,075,572
Cash-settled stock appreciation rights \| Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance of stock-settled stock units and cash-settled stock appreciation rights (in shares) \| shares				23,000
Cash Settled Stock Units \| Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance of cash-settled stock units \| shares				1,600
Cash-settled stock-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted \| shares				15,000
Liability-classified share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance of cash-settled stock units \| shares				24,600
Stock-based compensation expense, fair value adjustment				$ 114,000	$ 376,000	$ (236,000)
Shares vested in period (in shares) \| shares				0
Stock-based compensation liability				$ 99,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants \| shares				7,124,027
Employee entitlement for purchase of the Company's common stock during each calendar year				$ 25,000
Stock purchase price as percentage of fair market value	100.00%	100.00%		85.00%
Contributions used to purchase stock accumulated through payroll withholdings or through optional lump sum payments				$ 22,131,000	$ 23,902,000	$ 24,523,000
Stock issued for employee stock purchase plans \| shares				360,368	438,002	413,859
Expected volatility Rate				23.00%	22.00%	26.00%
Risk-free interest rate				1.30%	0.80%	0.20%
Weighted average fair value \| $ / shares				$ 15.19	$ 16.73	$ 18.76
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 34,431,000	$ 34,530,000	$ 52,665,000