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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On October 15, 2013, the Company announced that its Board of Directors declared a cash dividend of $0.30 per common share or approximately $5.7 (including dividend equivalents), which will be paid on or about November 15, 2013 to stockholders of record at the close of business on October 25, 2013. Anti-dilution Adjustments to Convertible Notes and Convertible Note Hedge Transactions. Based on the Company’s closing stock price for its common stock on the ex-dividend date for the quarterly dividend declared on October 15, 2013, (a) the Convertible Notes’ conversion rate will be 20.7903 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price will be $48.10 per share, (b) the Call Options’ exercise price will be approximately $48.10 per share, and (c) the Warrants’ exercise price will each be $61.08 per share.