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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 |  |  |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  |
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Jul. 31, 2012 | Apr. 30, 2012 | Feb. 29, 2012 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 15, 2012 | Mar. 27, 2012 | Mar. 16, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] Restructuring Charges [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] Restructuring Charges [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and Administrative Expense [Member] | Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and Administrative Expense [Member] | Jun. 30, 2012 2012 Three-year PSU Awards [Member] | Mar. 27, 2012 2012 Three-year PSU Awards [Member] | Jun. 30, 2012 2012 Three-year PSU Awards [Member] Maximum [Member] | Jun. 30, 2012 2012 Three-year PSU Awards [Member] Minimum [Member] | Jun. 30, 2012 2011 Three-year PSU Awards [Member] | Mar. 11, 2011 2011 Three-year PSU Awards [Member] | Jun. 30, 2012 2011 Three-year PSU Awards [Member] Maximum [Member] | Jun. 30, 2012 2011 Three-year PSU Awards [Member] Minimum [Member] | Jun. 30, 2012 2010 Three-year PSU Awards [Member] | Mar. 08, 2010 2010 Three-year PSU Awards [Member] | Jun. 30, 2012 2010 Three-year PSU Awards [Member] Maximum [Member] | Jun. 30, 2012 2010 Three-year PSU Awards [Member] Minimum [Member] | Jun. 30, 2012 2012 CEO Incentive Compensation [Member] | Mar. 27, 2012 2012 CEO Incentive Compensation [Member] | Jun. 30, 2012 2012 CEO Incentive Compensation [Member] Maximum [Member] | Jun. 30, 2012 2012 CEO Incentive Compensation [Member] Minimum [Member] | Dec. 31, 2012 SLO Awards [Member] | Jun. 30, 2012 SLO Awards [Member] | Mar. 09, 2012 SLO Awards [Member] | Dec. 31, 2011 SLO Awards [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted number of common stock shares to be earned under the performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 414,226 |  |  |  | 380,617 |  |  |  | 413,642 |  |  |  | 273,834 |  |  |  |  |  |  |
Targeted number of common stock shares to be earned under the performance incentive plan for adjusted EBITDA goal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,855 |  |  |  |  |  |  |
Aggregate increase or decrease in the number of shares earned for all participants based on the performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,423 |  |  |  | 38,062 |  |  |  | 41,364 |  |  |  |  |  |  |  |  |  |  |
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% |  |  | 200.00% | 0.00% |  |  |  |
Per share price of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.72 |  |  |  | $ 26.18 |  |  |  | $ 20.88 |  |  |  |  |  |  |  |  |  |
Valuation Per Share |  |  |  |  |  |  |  |  | $ 23.40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target level for the determination of performance goals and measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  | 84.00% |  |  |  | 97.00% |  |  |  |  |  |  |  |  |  |  |
Target level for the determination of performance goals and measures for adjusted EBITDA goal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79.00% |  |  |  |  |  |  |
Maximum level for the determination of performance goals and measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 159.00% |  |  |  |  |  |  |  |  |  |  |
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 414,226 |  |  |  | 159,859 |  |  |  | 200,616 |  |  |  |  |  |  |  |  |  |  |
Common stock share price on grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.72 |  |  |  |  |  |
Share based compensation stock award premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  | 25.00%
Restricted stock shares and restricted stock units included in SLO Award target |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,731 | 11,212 |
Targeted number of common stock shares to be earned under performance incentive plan at volume target level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,604 |  |  |  | 328,845 |  |  |  |  |  |  |  |  |  |  |
Percentage targeted number of common stock shares net of forfeiture related to volume goal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 8 | $ (9) | $ 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment due to exercise SARs |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  | 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for SARs |  |  |  |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 27.0 | 27.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target level for determination of net debt reduction goals measures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Targeted number of common stock shares to be earned for net debt reduction goals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,150 |  |  |  |  |  |  |
Additional Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.13 | $ 0.13 | $ 0.13 |  |  | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated dividend payment | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued | 194,000,000 |  |  | 204,179,917 |  | 204,179,917 |  |  |  |  | 202,528,616 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding | 194,000,000 |  |  | 194,120,605 |  | 194,120,605 |  |  |  |  | 192,062,185 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available cash to pay cash dividend |  |  |  |  |  |  |  | 25 |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for SARs |  |  |  |  |  |  |  |  |  |  |  | 0.1 | 0.1 | 27.0 | 27.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share |  |  |  | $ 0.13 | $ 0.13 | $ 0.26 | $ 0.26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid of current quarter in available cash |  |  |  |  |  | $ 50.4 | $ 41.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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