Common shares withheld and cancelled to satisfy statutory tax withholding obligation.

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- Definition

Number of common share received by the employee on vesting of restricted stock unit.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options cancelled in Period.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payments award equity instruments other than options cancelled in period weighted average grant date fair value.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Name Staff Accounting Bulletin (SAB)

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-Section F

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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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Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. 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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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

+ References

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- Definition

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).

+ References

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph b(2)(a)

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-Name Accounting Standards Codification

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-Paragraph 2

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

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-Name Accounting Standards Codification

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-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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- Definition

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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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

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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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (SX 210.5-02.28,29)

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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-Name Accounting Standards Codification

-Topic 505

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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Employee Incentive Plans, Long term Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 years	Jun. 30, 2011	Dec. 31, 2011 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized for issuance under Equity Incentive Plan	2,722,222		2,722,222
Number of common shares available for additional awards under Equity Incentive Plan	933,384		933,384
Total non-cash compensation expense	$ 1.1	$ 1.2	$ 3.6	$ 2.6
Stock Options
Fully-vested options outstanding	20,791		20,791		20,791
Exercise price of options to purchase common stock	$ 80.01		$ 80.01		$ 80.01
Remaining contractual life of options outstanding			4.75		5.25
Grant date fair value of options outstanding			$ 39.90		$ 39.90
Stock options granted			0
Stock options forfeited			0
Stock options exercised			0
Vested Stock
Common shares withheld and canceled			45,128	23,078
Fabricated Products
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total non-cash compensation expense	0.4	0.4	1.1	0.8
All Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total non-cash compensation expense	0.7	0.8	2.5	1.8
Non-vested common shares
Summary of Activity
Outstanding at December 31, 2011, Shares			202,836
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value per Share			$ 29.24
Granted, shares			92,949	76,803
Granted, Weighted-Average Grant-Date Fair Value per Share			$ 45.03	$ 47.19
Vested, shares			(132,913)	(62,028)
Vested, Weighted-Average Grant-Date Fair Value per Share			$ 24.02	$ 51.63
Forfeited, shares			(2,068)
Forfeited, Weighted-Average Grant-Date Fair Value per Share	$ 43.72		$ 43.72
Canceled, Shares			0
Canceled, Weighted-Average Grant-Date Fair Value per Share			$ 0
Outstanding at June 30, 2012, Shares	160,804		160,804
Outstanding at June 30, 2012, Weighted-Average Grant-Date Fair Value per Share	$ 42.50		$ 42.50
Non-vested common shares \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period, years			1
Non-vested common shares \| Executive officers and senior management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period, years			3
Non-vested common shares \| Other key employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period, years			3
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common share received by the employee on vesting of restricted stock unit			1
Summary of Activity
Outstanding at December 31, 2011, Shares			6,072
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value per Share			$ 33.67
Granted, shares			2,486	2,182
Granted, Weighted-Average Grant-Date Fair Value per Share			$ 44.46	$ 46.59
Vested, shares			(3,375)	(3,314)
Vested, Weighted-Average Grant-Date Fair Value per Share			$ 25.77	$ 16.83
Forfeited, shares			0
Forfeited, Weighted-Average Grant-Date Fair Value per Share	$ 0		$ 0
Canceled, Shares			0
Canceled, Weighted-Average Grant-Date Fair Value per Share			$ 0
Outstanding at June 30, 2012, Shares	5,183		5,183
Outstanding at June 30, 2012, Weighted-Average Grant-Date Fair Value per Share	$ 43.99		$ 43.99
Service-based non-vested common shares and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total non-cash compensation expense	0.7	0.9	2.4	1.9
Unrecognized gross compensation costs, by award type	4.9		4.9
Expected period (in years) over which the remaining gross compensation costs will be recognized, by award type			1.8
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period, years			3
Total non-cash compensation expense	0.4	0.3	1.2	0.7
Unrecognized gross compensation costs, by award type	$ 7.6		$ 7.6
Expected period (in years) over which the remaining gross compensation costs will be recognized, by award type			2.4
Summary of Activity
Outstanding at December 31, 2011, Shares			777,934
Outstanding at December 31, 2011, Weighted-Average Grant-Date Fair Value per Share			$ 26.84
Granted, shares			215,579	186,918
Granted, Weighted-Average Grant-Date Fair Value per Share			$ 44.47	$ 46.59
Vested, shares			(7,952)	(10,585)
Vested, Weighted-Average Grant-Date Fair Value per Share			$ 18.89	$ 74.34
Forfeited, shares			0
Forfeited, Weighted-Average Grant-Date Fair Value per Share	$ 0		$ 0
Canceled, Shares			(400,761)
Canceled, Weighted-Average Grant-Date Fair Value per Share			$ 14.67
Outstanding at June 30, 2012, Shares	584,800		584,800
Outstanding at June 30, 2012, Weighted-Average Grant-Date Fair Value per Share	$ 41.79		$ 41.79
French Subsidiary \| Restricted stock units (RSUs) \| Second anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based award vesting schedule			0.67
French Subsidiary \| Restricted stock units (RSUs) \| Third anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based award vesting schedule			0.33
Non-French Subsidiary \| Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period, years			3
Non-French Subsidiary \| Restricted stock units (RSUs) \| First anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based award vesting schedule			0.33
Non-French Subsidiary \| Restricted stock units (RSUs) \| Second anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based award vesting schedule			0.33
Non-French Subsidiary \| Restricted stock units (RSUs) \| Third anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based award vesting schedule			0.33