Share Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2011 Y D business segment market	Sep. 30, 2010
Share Based Compensation (Additional Textuals) [Abstract]
Typical vesting rate for options granted	Over three years
Cash received for exercises of stock options	$ 0.4	$ 0.2
Tax benefit realized from stock option exercises	0.1	0.1
Exercise of stock option	99,000
Award vested as of grant date	1.00%
Granted, weighted average grant date fair value per share	$ 6.27
Total unrecognized compensation cost related to nonvested awards	32.2
Weighted-average expense recognition period	2.0
Common stock authorized for issuance	38,800,000
Common stock outstanding	35,700,000
Common stock available for future grants	3,100,000
After May 2004 [Member]
Share Based Compensation (Textuals) [Abstract]
Options granted, term	P7Y
Prior to May 2004 [Member]
Share Based Compensation (Textuals) [Abstract]
Options granted, term	P10Y
Restricted stock awards [Member]
Share Based Compensation (Textuals) [Abstract]
Total fair value of awards vested	$ 8.7	$ 2.8
Share Based Compensation (Additional Textuals) [Abstract]
Granted, weighted average grant date fair value per share	$ 0	$ 6.20

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Share Based Compensation Arrangement By ShareBased Payment Award Shares Issued.

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Share Based Compensation Arrangement By ShareBased Payment Award Term.

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Share Based Compensation.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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- Definition

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

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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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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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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Number of share options (or share units) exercised during the current period.

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