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Debt (Narrative) (Details) (USD $)
0 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended0 Months Ended9 Months Ended12 Months Ended0 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended9 Months Ended12 Months Ended
Jun. 15, 2011
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
Investment And Other Income (Expense) [Member]
Sep. 30, 2011
Investment And Other Income (Expense) [Member]
Jun. 01, 2011
7.25% Senior Notes Due May 15, 2018 [Member]
Sep. 30, 2011
7.25% Senior Notes Due May 15, 2018 [Member]
Dec. 31, 2010
7.25% Senior Notes Due May 15, 2018 [Member]
Sep. 28, 2011
11.25% Senior Notes Due February 1, 2019 [Member]
Sep. 30, 2011
11.25% Senior Notes Due February 1, 2019 [Member]
Sep. 30, 2010
11.25% Senior Notes Due February 1, 2019 [Member]
Dec. 31, 2010
11.25% Senior Notes Due February 1, 2019 [Member]
Sep. 30, 2011
6.125% Senior Notes Due January 15, 2017 [Member]
Sep. 30, 2010
6.125% Senior Notes Due January 15, 2017 [Member]
Dec. 31, 2010
6.125% Senior Notes Due January 15, 2017 [Member]
Sep. 30, 2011
5.50% Senior Notes Due May 15, 2015 [Member]
Sep. 30, 2010
5.50% Senior Notes Due May 15, 2015 [Member]
Dec. 31, 2010
5.50% Senior Notes Due May 15, 2015 [Member]
Debt Instrument [Line Items]                      
Amount of difference between fair value and book value $ 229,800,000  $ 229,800,000 $ 259,300,000               
Debt instrument face amount         600,000,000            
Interest rate5.50%  4.95%     7.25%7.25%7.25%11.25%11.25% 11.25%6.125% 6.125%5.50% 5.50%
Maturity dateMay 15, 2015May 15, 2010May 15, 2018May 15, 2018May 15, 2018Feb. 01, 2019Feb. 01, 2019Feb. 01, 2019Feb. 01, 2019Jan. 15, 2017Jan. 15, 2017Jan. 15, 2017May 15, 2015May 15, 2015May 15, 2015
Interest rate terms         Interest on the notes is payable semi-annually on May 15 and November 15 of each year, commencing on November 15, 2011            
Repurchase of debt100,000,000  174,200,000        11,600,000216,200,000  100,000,000  100,000,000  
Loss on debt extinguishment    69,900,000  1,300,00069,900,000             
Interest income $ 2,900,000$ 1,900,000 $ 9,100,000$ 5,500,000