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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On April 15, 2013, the Company announced that its Board of Directors declared a cash dividend of $0.30 per common share or $5.8 (including dividend equivalents), which will be paid on or about May 15, 2013 to stockholders of record at the close of business on April 25, 2013. Anti-dilution Adjustments to Convertible Notes and Convertible Note Hedge Transactions. Upon the payment of the quarterly dividend declared on April 15, 2013, (a) the Convertible Notes’ conversion rate will be 20.7522 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price will be $48.19 per share, (b) the Call Options’ exercise price will be approximately $48.19 per share, and (c) the Warrants’ exercise price will be $61.19 per share. Stock Repurchase Authorization. In April 2013, the Company’s Board of Directors authorized an additional $75.0 for stock repurchases under the existing stock repurchase program. Subsequent to March 31, 2013 and through April 19, 2013, the Company repurchased 210,835 shares of its common stock at a weighted average price of $60.94 per share. On April 19, 2013, $92.8 remained available for future repurchases under the stock repurchase program.