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Note 12 - Equity Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Jan. 15, 2021	Mar. 31, 2021	Mar. 31, 2020
Proceeds from Stock Options Exercised		$ 7.6	$ 19.2
Nonqualified Stock Option, Contractual Term (Year)		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	706,507	709,811
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)		6 years 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)		4 years 9 months 18 days
Unrecognized Compensation Cost Related to Nonvested Share Based Compensation Arrangements		$ 128.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 6.2	5.6
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Per Award (in shares)		1
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels		100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	59,144	59,144
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 3.1	2.1
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels		0.00%
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels		200.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	134,777	135,380
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 6.8	$ 6.1
Employee Stock Purchase Plan [Member] | UK Sharesave Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		454,205
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date		5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		0	0
Employee Stock Purchase Plan [Member] | US ESPP [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		1,250,129
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		10,137	9,451
Value of Common Stock Issued to Employees Per Share (in dollars per share)		$ 167.84	$ 132.41
The 2013 Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		1,937,143

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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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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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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- Definition

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

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No definition available.

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Number of shares issued under share-based payment arrangement.

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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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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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Description of the estimated period of time over which an employee may exercise the vested nonqualified stock option granted. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

+ References

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- Definition

The number of shares issued per award in a share-based compensation arrangement.

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No definition available.

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The percent target levels for an award in a share-baesd compensation arrangement.

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- Definition

As of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees and non-employees under share-based compensation plans that have yet to vest.

+ References

No definition available.

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- Definition

This element represents the discount price per share offered to employees who participate in the ESPP Plan.

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