Aggregate number of common shares reserved for future issuance.

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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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Estimated period when employee is required to provide service in exchange for 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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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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Gross number of share options (or share units) granted during the period.

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Number of shares issued under share-based payment arrangement.

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

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

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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).

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

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

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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.

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

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Note 8 - Equity Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Proceeds from Stock Options Exercised		$ 5.6	$ 22.9	$ 16.2	$ 47.6
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				293,498
Nonqualified Stock Option, Contractual Term (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels	100.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term (Year)				5 years 9 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted-Average Remaining Contractual Term (Year)				4 years 4 months 24 days
Unrecognized Compensation Cost Related to Nonvested Share Based Compensation Arrangements		$ 128.3		$ 128.3
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				2 years 7 months 6 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Target Levels	0.00%
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, Equity Instruments Other than Options, Grants in Period (in shares)				192,701
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	4 years
Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				102,583
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Per Award (in shares)	1
Nonqualified Stock Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	4 years
Employee Stock Purchase Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		1,129,161		1,129,161
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)				12,905	8,659
Value of Common Stock Issued to Employees Per Share (in dollars per share)		$ 175.71	$ 288.78	$ 175.71	$ 288.78
Employee Stock Purchase Plan [Member] \| UK Sharesave Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		437,431		437,431
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				0	0
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%
Key Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	282,414
Key Employees [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	169,187
Key Employees [Member] \| Performance Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	62,662
Key Employees [Member] \| TSR Based PSUs [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	39,097
Key Employees [Member] \| Performance Stock ROIC-based [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	23,565
The 2021 Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		11,235,308		11,235,308