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Stockholders' Equity (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended3 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended1 Months Ended1 Months Ended
Oct. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
PSU awards [Member]
Sep. 30, 2011
2011 Three-year PSU Awards [Member]
Mar. 11, 2011
2011 Three-year PSU Awards [Member]
Sep. 30, 2011
2011 Three-year PSU Awards [Member]
Maximum [Member]
Sep. 30, 2011
2011 Three-year PSU Awards [Member]
Minimum [Member]
Sep. 30, 2011
2010 Three-year PSU Awards [Member]
Mar. 08, 2011
2010 Three-year PSU Awards [Member]
Sep. 30, 2011
2010 Three-year PSU Awards [Member]
Maximum [Member]
Sep. 30, 2011
2010 Three-year PSU Awards [Member]
Minimum [Member]
Sep. 30, 2011
2009 Three-year PSU Awards [Member]
Mar. 08, 2011
2009 Three-year PSU Awards [Member]
Mar. 05, 2010
2009 Three-year PSU Awards [Member]
Sep. 30, 2011
2009 Three-year PSU Awards [Member]
Maximum [Member]
Sep. 30, 2011
2009 Three-year PSU Awards [Member]
Minimum [Member]
Feb. 28, 2011
2009 Two-year PSU Awards [Member]
Sep. 30, 2011
SLO Awards [Member]
Sep. 30, 2010
SLO Awards [Member]
Feb. 28, 2011
2005 Contingent stock plan [Member]
Sep. 30, 2011
2005 Contingent stock plan [Member]
Stockholders Equity (Textual) [Abstract]                           
Dividends accrued in other current liabilities        $ 2                  
Targeted number of common stock shares to be earned under the performance incentive plan         384,714   416,160   545,672         
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                  $ 16.70        
Aggregate increase or decrease in the number of shares earned for all participants based on the performance         38,471   44,616   54,567         
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                 1,091,344         
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                       77,92634,596  
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 (Textual) [Abstract]                           
Estimated dividend payment 25   25                     
Common stock issued192,000,000170,753,019   170,753,019 169,272,636                   
Common stock outstanding192,000,000160,307,308   160,307,308 159,305,507                   
Dividends declared per common share$ 0.13$ 0.13$ 0.13$ 0.13                       
Dividends paid per common share $ 0.13$ 0.13$ 0.13$ 0.13$ 0.39$ 0.37                    
Cash dividend paid of current quarter in available cash     $ 62.4$ 59.0                    
Period in the beginning of each year to award Performance Share Unit     90 days