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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On July 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 August 15, 2013 to stockholders of record at the close of business on July 25, 2013. Anti-dilution Adjustments to Convertible Notes and Convertible Note Hedge Transactions. Upon the payment of the quarterly dividend declared on July 15, 2013, (a) the Convertible Notes’ conversion rate will be 20.7714 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price will be $48.14 per share, (b) the Call Options’ exercise price will be approximately $48.14 per share, and (c) the Warrants’ exercise price will be $61.14 per share. Stock Repurchase Authorization. Subsequent to June 30, 2013 and through July 18, 2013, the Company repurchased 28,600 shares of its common stock at a weighted average price of $63.51 per share. On July 18, 2013, $79.6 remained available for future repurchases under the stock repurchase program.