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Aggregate increase or decrease in the number of shares earned for all participants based on the performance.

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Recordable incident rate to be achieved under additional goal.

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Share based compensation stock award premium.

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Shares at maximum level of Probable achievement of the operating profit performance goals and other measures.

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Shares to be issued as a percentage of target shares under the performance incentive plan.

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Stockholders' Equity.

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Targeted number of common stock shares to be earned under the performance incentive plan.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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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Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended					6 Months Ended		6 Months Ended				6 Months Ended				6 Months Ended		1 Months Ended				1 Months Ended
	Jul. 31, 2011	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jul. 15, 2011	Dec. 31, 2010	Jun. 30, 2011 PSU awards [Member]	Jun. 30, 2011 2011 Three-year PSU Awards [Member]	Mar. 11, 2011 2011 Three-year PSU Awards [Member]	Jun. 30, 2011 2011 Three-year PSU Awards [Member] Maximum [Member]	Jun. 30, 2011 2011 Three-year PSU Awards [Member] Minimum [Member]	Jun. 30, 2011 2010 Three-year PSU Awards [Member]	Mar. 05, 2010 2010 Three-year PSU Awards [Member]	Jun. 30, 2011 2010 Three-year PSU Awards [Member] Maximum [Member]	Jun. 30, 2011 2010 Three-year PSU Awards [Member] Minimum [Member]	Jun. 30, 2011 2009 Three-year PSU Awards [Member]	Mar. 05, 2010 2009 Three-year PSU Awards [Member]	Jun. 30, 2011 2009 Three-year PSU Awards [Member] Maximum [Member]	Jun. 30, 2011 2009 Three-year PSU Awards [Member] Minimum [Member]	Feb. 28, 2011 2009 Two-year PSU Awards [Member]	Jun. 30, 2011 SLO Awards [Member]	Dec. 31, 2010 SLO Awards [Member]	Jun. 30, 2010 SLO Awards [Member]	Feb. 28, 2011 2005 Contingent stock plan [Member]	Jun. 30, 2011 2005 Contingent stock plan [Member]
Stockholders' Equity (Textuals) [Abstract]
Dividends accrued in other current liabilities								$ 2
Targeted number of common stock shares to be earned under the performance incentive plan									409,410				433,481				555,131
Increase or decrease in the number of shares earned for each participant based on the performance									up to 10% of target level				up to 10% of target level				up to 10% of target level
Share price related to additional goals		$ 23.79		$ 23.79
Aggregate increase or decrease in the number of shares earned for all participants based on the performance									40,941				43,348				55,113
Shares to be issued as a percentage of target shares under the performance incentive plan											200.00%	0.00%			200.00%	0.00%			200.00%	0.00%
Per share price of common stock										$ 26.18				$ 20.88				$ 20.88
Target level for the determination of performance goals and measures									100.00%				100.00%
Maximum level for the determination of performance goals and measures													200.00%				200.00%
Shares at maximum level, net of forfeitures																	1,102,262
Shares of common stock issued for the 2009 two-year PSU awards																					1,114,139
Recordable incident rate to be achieved under additional goal									1.20 or better				1.20 or better				1.30 or better
Incremental in annual cash bonus																						25.00%
Share based compensation stock award premium																						25.00%		25.00%
Restricted stock shares and restricted stock units included in SLO Award target																						94,935	34,596
Acquired stock under 2005 contingent stock plan																									408,751
Shares withheld for Minimum tax obligation in treasury Stock at fair value																										12
Additional Stockholders Equity (Textuals) [Abstract]
Estimated dividend payment						21
Common stock issued	160,000,000	170,648,419		170,648,419			169,272,636
Common stock outstanding	160,000,000	160,210,558		160,210,558			159,305,507
Dividends declared per common share	$ 0.13			$ 0.13
Dividends declared and paid per common share		$ 0.13	$ 0.12	$ 0.26	$ 0.24
Cash dividend paid of current quarter in available cash				$ 41.6	$ 38.3
Period in the beginning of each year to award Performance Share Unit					90 days