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Note 10 - Stock-based Compensation - Stock-based Compensation Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Per share intrinsic value of non-vested stock granted (in dollars per share)	$ 82.90	$ 88.74	$ 68.99
Weighted average per share discount from market value for shares purchased (in dollars per share)	$ 13	$ 15.89	$ 11.92
Total intrinsic value of stock options exercised (in millions)		$ 0.5	$ 3.1
Fair value of non-vested stock that vested during the period (in millions)	47.5	19.3	18.9
Tax benefit recognized in Consolidated Statements of Operations (in millions)	3.8	4.2	2.6
Cash received from options exercised and shares purchased under all share-based arrangements (in millions)	7.0	6.5	4.9
Tax deduction realized related to stock options exercised (in millions)	8.9	7.6	8.4
Selling, General and Administrative Expenses [Member]
Stock-based compensation recognized in Consolidated Statements of Operations, as a component of selling, general and administrative expense (in millions)	$ 11.0	$ 11.9	$ 7.4

X

- Definition

The weighted average discount per share for compensation expense recognized under the 2009 ESPP.

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

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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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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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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 grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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