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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On April 15, 2014, the Company announced that its Board of Directors declared a cash dividend of $0.35 per common share or approximately $6.4 (including dividend equivalents), which will be paid on or about May 15, 2014 to stockholders of record at the close of business on April 25, 2014. 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 in April 2014, (a) the Convertible Notes’ conversion rate will be 20.8549 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price will be $47.95 per share, (b) the Call Options’ exercise price will be approximately $47.95 per share, and (c) the Warrants’ exercise price will each be $60.89 per share.