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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On October 15, 2012, the Company announced that its Board of Directors declared a cash dividend of $0.25 per common share or $4.9 (including dividend equivalents), which will be paid on or about November 15, 2012 to stockholders of record at the close of business on October 25, 2012. Anti-dilution Adjustments to Convertible Notes and Convertible Note Hedge Transactions. Upon the payment of the quarterly dividend on November 15, 2012, (a) the Convertible Notes' conversion rate will increase slightly to 20.7111 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price will be $48.28 per share, (b) the Call Options' exercise price will be approximately $48.28 per share, and (c) the Warrants' exercise price will be $61.31 per share.