Equity and Cash Incentive Program (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	17,000,000
Vesting period (in years)	3 years
Award term	10 years
Additional Disclosures [Abstract]
Tax benefit from the exercise of share-based awards	$ 4,964	$ 661	$ 15,110
Stock-based compensation expense [Abstract]
Pre-tax compensation expense	21,015	30,697	31,628
Tax benefit	(7,399)	(10,877)	(11,201)
Total stock-based compensation expense, net of tax	$ 13,616	$ 19,820	$ 20,427
Shares Granted to Directors [Abstract]
Aggregate shares granted	21,023	21,205	17,331
Shares deferred	(11,882)	(11,196)	(8,904)
Shares withheld to satisfy tax obligations	0	0	(210)
Net shares granted	9,141	10,009	8,217
Stock Appreciation Rights (SARs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate (in hundredths)	1.05%	1.51%	1.70%
Dividend yield (in hundredths)	3.09%	2.24%	1.98%
Expected life (in years)	4 years 7 months	5 years 1 month	5 years 4 months
Volatility (in hundredths)	26.17%	27.19%	30.81%
Fair value on date of grant	$ 9.25	$ 14.55	$ 19.84
Awards Outstanding [Roll Forward]
Awards Outstanding (in number of shares)	7,253,827	7,810,593
Awards Modified upon spin-off (in number of shares)			933,845
Awards Granted (in number of shares)	1,346,354	1,144,529	1,043,734
Awards Forfeit and Expired (in number of shares)	(400,942)
Awards Exercised (in number of shares)	(1,502,178)
Awards Exercisable (in number of shares)	4,326,534
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Awards Outstanding, Weighted Average Exercise Price	$ 59.00	$ 57.32
Awards Granted, Weighted Average Exercise Price	57.25	$ 73.28	$ 82.51
Awards Forfeit and Expired, Weighted Average Exercise Price	68.67
Awards Exercised, Weighted Average Exercise Price	46.15
Awards Exercisable, Weighted Average Exercise Price	$ 51.98
Additional Disclosures [Abstract]
Awards Outstanding, Weighted Average Remaining Contractual Term	5 years 10 months 24 days
Awards Exercisable, Weighted Average Remaining Contractual Term	4 years 3 months 18 days
Fair value of stock appreciation rights which became exerciable during the year	$ 24,843	$ 25,380	$ 26,796
Awards Exercised, Total Intrinsic Value	34,916	14,560	$ 51,813
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	$ 8,846
Unrecognized Compensation Expense, Period for Recognition	1 year 7 months 6 days
Stock Options [Member]
Awards Outstanding [Roll Forward]
Awards Modified upon spin-off (in number of shares)			20,523
Additional Disclosures [Abstract]
Awards Exercised, Total Intrinsic Value	$ 0	1,649	$ 8,614
Cash received for the exercise of stock options	$ 0	$ 1,468	$ 5,227
Performance Shares [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Fair value on date of grant	$ 57.25	$ 73.28	$ 82.51
Awards Outstanding [Roll Forward]
Awards Modified upon spin-off (in number of shares)			11,480
Unvested Awards [Roll Forward]
Awards Unvested (in number of shares)	122,166	116,060
Awards Granted (in number of shares)	79,561	61,611	58,206
Awards Forfeit (in number of shares)	(28,126)
Awards Vested (in number of shares)	(45,329)
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Awards Unvested, Weighted Average Grant Date Fair Value	$ 65.29	$ 77.61
Awards Forfeit, Weighted Average Grant Date Fair Value	70.29
Awards Vested, Weighted Average Grant Date Fair Value	$ 82.51
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	$ 38
Unrecognized Compensation Expense, Period for Recognition	2 years
Performance Share Attainment	1.20%	0.00%	11.55%
Restricted Stock Units (RSUs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Fair value on date of grant	$ 57.25
Awards Outstanding [Roll Forward]
Awards Modified upon spin-off (in number of shares)			5,389
Unvested Awards [Roll Forward]
Awards Unvested (in number of shares)	336,546	254,572
Awards Granted (in number of shares)	249,263	145,545	131,719
Awards Forfeit (in number of shares)	(38,391)
Awards Vested (in number of shares)	(128,898)
Unvested Awards, Weighted Average Grant Date Fair Value [Roll Forward]
Awards Unvested, Weighted Average Grant Date Fair Value	$ 64.74	$ 75.07
Awards Forfeit, Weighted Average Grant Date Fair Value	63.96
Awards Vested, Weighted Average Grant Date Fair Value	$ 73.81
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	$ 6,478
Unrecognized Compensation Expense, Period for Recognition	1 year 8 months 12 days
Additional Paid-in Capital [Member]
Additional Disclosures [Abstract]
Tax benefit from the exercise of share-based awards	$ 4,964	$ 661	$ 15,110

Common stock issued to directors, net of tax obligations.

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Current expected payout of performance condition awards based on company performance relative to established internal metrics.

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The date when the equity-based award expires as specified in the award agreement.

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Incremental shares issued to employees as a result of the plan modification.

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Share Based Goods and Nonemployee Services Transaction Aggregate Shares Granted

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Shares deferred

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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).

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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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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