9. Share-based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	$ 4,200,000	$ 2,100,000	$ 1,600,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	6,300,000	1,500,000	3,600,000
Share-based Compensation Expense	23,400,000	19,700,000	17,000,000.0
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 5,800,000	$ 5,100,000	4,300,000
2011 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized	1,300,000
Stock Option and Award Plans [Member] \| Incentive Award Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Authorized	1,999,714
Number of Shares Available for Grant	1,771,794
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Remaining Contractual Term (in years) - Outstanding	5 years 1 month 2 days
Aggregate Intrinsic Value (in millions) - Outstanding	$ 48.2
Options - Weighted-Average Exercise Price	$ 120.39	$ 106.52
Options Granted - Weighted Average Exercise Price	215.98
Options Exercised - Weighted Average Exercise Price	$ 89.41
Options Granted Term	P10Y
Options Forfeitured/expired - Weighted Average Exercise Price	$ 177.99
Options - Shares Vested and Expected to Vest	125,720
Options Vested and Expected to Vest - Weighted Average Exercise Price	$ 164.84
Options Vested and Expected to Vest - Weighted Average Remaining Contractual Term (in years)	8 years 3 months 14 days
Options Vested and Expected to Vest - Aggregate Intrinsic Value (in millions)	$ 9.3
Weighted Average Exercise Price - Options Exercisable	$ 100.56
Weighted Average Remaining Contractual Term (in years) - Exercisable	3 years 7 months 28 days
Options Exercisable Aggregate Intrinsic Value (in millions)	$ 38.9
Options, Exercises in Period, Total Intrinsic Value	10,000,000	$ 1,000,000	13,000,000
Cash Received from Exercise of Stock Options	1,600,000	1,200,000	2,900,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options		$ 6,000,000.0	$ 9,300,000
Total unrecognized compensation cost from stock options	$ 5,500,000
Options Number Exercisable	281,760
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	20.00%	21.00%	23.00%
Risk Free Interest Rate	1.87%	1.35%	1.90%
Expected life (in years)	7 years 2 months 12 days	7 years 4 months 24 days	7 years 8 months 12 days
Expected dividend	$ 0	$ 0	$ 0
Weighted average fair value of options granted	$ 58.65	$ 42.40	$ 42.74
Expected dividend yield	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning of period	449,570
Options - Shares Granted	44,000
Options - Shares Exercised	(78,890)
Options - Shares Forfeitures/expired	(7,200)
Outstanding end of period	407,480	449,570
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant	721,712
Cash Received from Exercise of Stock Options	$ 13,000,000.0	$ 11,500,000	$ 10,800,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans	74,409	93,605	96,634
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	19.00%	20.00%	18.00%
Risk Free Interest Rate	0.83%	0.26%	0.02%
Expected life (in years)	7 days	7 days	7 days
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	$ 38.86	$ 27.36	$ 25.08
Stock Award Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	20.00%
Stock Award Plans [Member] \| Incentive Award Plan 2017 [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, Maximum Employee Contribution Amount

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 718
-SubTopic 10
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Unrecognized cost of unvested share-based compensation awards.

+ References

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

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- Definition

Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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

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

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- Definition

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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- 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.

+ References

No definition available.

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- Definition

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

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- Definition

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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- Definition

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 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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- Definition

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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- 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

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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- Definition

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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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- Definition

Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

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No definition available.

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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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No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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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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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.

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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.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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.

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- Definition

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

+ References

Reference 1: 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=84159872&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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