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Maximum stock-based compensation expense assuming the achievement of highest level of performance goals.

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Number of individual price target.

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The number of performance conditions required to be met under the stock plan.

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Total amount of performance metrics that are able to be met under the stock plan.

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The maximum number of PSU's an employee may receive as a percentage.

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The first tier maximum number of PSU's an employee may receive as a percentage.

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The second tier maximum number of PSU's an employee may receive as a percentage.

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Price of a single share of a number of saleable stocks that the employee pays to the company upon vesting of the shares.

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Represents the adjustment 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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Number of individual tranches in a single share-based payment award plan.

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Represents the intrinsic value for stock purchased under the employee stock purchase plan.

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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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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 cash inflow associated with the amount received from the stock plan during the 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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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 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 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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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.

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

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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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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit 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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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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Number of shares issued during the period as a result of an employee stock purchase plan.

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Note 2 - Stock-based Compensation (Details Textual)	1 Months Ended			3 Months Ended		12 Months Ended
Note 2 - Stock-based Compensation (Details Textual)	Mar. 31, 2016 USD ($) $ / shares shares	Feb. 29, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Mar. 31, 2015 USD ($) shares	Dec. 31, 2015 $ / shares	Nov. 13, 2014 shares
2015 MPSUs [Member] \| Second, Third, and Fourth Tranches [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year
2015 MPSUs [Member] \| Second, Third, and Fourth Tranches [Member] \| Maximum [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			4 years
2015 MPSUs [Member] \| Second, Third, and Fourth Tranches [Member]
Number of Performance Condition to Meet			1
Number of Price Targets			5
Total number of performance conditions			6
2015 MPSUs [Member] \| Tranche One [Member] \| Minimum [Member]
Market Awards Price Targets			$ 71.36
2015 MPSUs [Member] \| Tranche One [Member] \| Maximum [Member]
Market Awards Price Targets			$ 95.57
2015 MPSUs [Member] \| Tranche One [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			4 years
Maximum Stock Compensation Costs	$ 8,300,000
Number of Price Targets			5
2015 MPSUs [Member] \| Tranche Two [Member]
Maximum Stock Compensation Costs	4,500,000
2015 MPSUs [Member] \| Tranche Three [Member]
Maximum Stock Compensation Costs	5,200,000
2015 MPSUs [Member] \| Tranche Four [Member]
Maximum Stock Compensation Costs	$ 6,600,000
2015 MPSUs [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares	13,000
2015 MPSUs [Member]
Share Price \| $ / shares			$ 61.35			$ 61.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares			127,000
PSUs Maximum Earn-Out			500.00%
Maximum Stock Compensation Costs	$ 24,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate						33.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate						1.30%
Number of MPSU Tranches			4
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions						7.80%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number \| shares	64,000			64,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares	64,000			64,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 17.30			$ 17.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				1 year 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 3,000,000			$ 3,000,000
Restricted Stock Units (RSUs) [Member] \| Chief Financial Officer [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Adjustment				2,900,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				29,100,000	$ 25,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding	$ 279,800,000			$ 279,800,000
Share Price \| $ / shares	$ 63.64			$ 63.64
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 109,000,000			$ 109,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				4 years 182 days
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				61,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
2016 Executive PSUs [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares	32,000
2016 Executive PSUs [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares		285,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
PSUs Maximum Earn-Out		300.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
Maximum Stock Compensation Costs		$ 30,000,000
2016 Non-Executive PSUs [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares		64,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
Maximum Stock Compensation Costs		$ 6,200,000
PSUs Maximum Earn-Out, Second Tier		200.00%
PSUs Maximum Earn-Out, First Tier		300.00%
2016 Executive PSUs and 2016 Non-executive PSUs [Member]
Share Price \| $ / shares		$ 58.98
Purchase Price Per Share \| $ / shares		$ 20
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		31.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		0.90%
Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan Shares Issued, Intrinsic Value				$ 400,000	$ 400,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares	4,700,000			4,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 200,000			$ 200,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans \| shares				29,000	30,000
Proceeds from Stock Plans				$ 1,300,000	$ 1,100,000
2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized \| shares							5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares	4,000,000			4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				1,074,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 1,100,000	2,500,000
Proceeds from Stock Options Exercised				464,000	1,292,000
Proceeds from Stock Plans				$ 1,285,000	$ 1,121,000