9. Share-based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 2,200,000	$ 2,100,000	$ 2,200,000
Share-based Compensation Expense	$ 17,000,000	$ 14,900,000	$ 13,700,000
2011 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized	600,000
Stock Option and Award Plans [Member] \| Incentive Award Plan (2007) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized	2,250,360
Number of Shares Available for Grant	770,094
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted Term	P10Y
Weighted Average Remaining Contractual Term (in years) - Outstanding	5 years 5 months 16 days
Aggregate Intrinsic Value (in millions) - Outstanding	$ 16.4
Options - Weighted-Average Exercise Price	$ 100.36	$ 84.50	$ 78.72	$ 70.83
Options Granted - Weighted Average Exercise Price	139.56	119.71	117.67
Options Exercised - Weighted Average Exercise Price	61.29	63.66	54.16
Options Forfeitured/expired - Weighted Average Exercise Price	$ 62.47	$ 100.29	$ 91.32
Options - Shares Vested and Expected to Vest	417,883
Options Vested and Expected to Vest - Weighted Average Exercise Price	$ 99.75
Options Vested and Expected to Vest - Weighted Average Remaining Contractual Term (in years)	5 years 4 months 28 days
Options Vested and Expected to Vest - Aggregate Intrinsic Value (in millions)	$ 16.3
Weighted Average Exercise Price - Options Exercisable	$ 89.43
Weighted Average Remaining Contractual Term (in years) - Exercisable	4 years 2 months 23 days
Options Exercisable Aggregate Intrinsic Value (in millions)	$ 13.9
Options, Exercises in Period, Total Intrinsic Value	13,000,000	$ 5,000,000	$ 11,000,000
Cash Received from Exercise of Stock Options	2,900,000	5,800,000	4,100,000
Tax Benefit Realized from Exercise of Stock Options	9,300,000	$ 5,300,000	$ 6,600,000
Total unrecognized compensation cost from stock options	$ 5,500,000
Options Number Exercisable	282,895
Options Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	20.00%
Weighted average fair value of options granted, period for recognition	3 years
Expected Volatility	23.00%	25.00%	28.00%
Risk Free Interest Rate	1.90%	2.35%	2.65%
Expected life (in years)	7 years 8 months 12 days	8 years 8 months 12 days	8 years 10 months 24 days
Expected dividend	$ 0	$ 0	$ 0
Weighted average fair value of options granted	$ 42.74	$ 43.96	$ 47.25
Expected dividend yield	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning of period	581,806	629,643	747,293
Options - Shares Granted	40,500	54,000	55,050
Options - Shares Exercised	(195,221)	(91,387)	(159,450)
Options - Shares Forfeitures/expired	(380)	(10,450)	(13,250)
Outstanding end of period	426,705	581,806	629,643
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant	189,726
Cash Received from Exercise of Stock Options	$ 10,800,000	$ 10,200,000	$ 10,000,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans	96,634	102,222	103,669
Employee Contribution Rate - Maximum	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Contribution Amount	$ 25,000
Employee Purchase Price Discount from Market Price	85.00%
Expected Volatility	18.00%	15.00%	19.00%
Risk Free Interest Rate	0.02%	0.04%	0.05%
Expected life (in years)	3 months	3 months	3 months
Expected dividend	$ 0	$ 0	$ 0
Expected dividend yield	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased	$ 25.08	$ 21.88	$ 21.76
Stock Award Plans [Member] \| Incentive Award Plan (2007) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	20.00%

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Contribution Amount

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Represents the expense 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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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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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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Discount rate from fair value on purchase date that participants pay for shares.

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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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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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No definition available.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.D.2)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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- Definition

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.

+ References

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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

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

+ References

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- 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 505
-SubTopic 10
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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 02
-Paragraph 29, 30
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