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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On January 14, 2013, the Company announced that its Board of Directors approved the declaration of a quarterly cash dividend of $0.30 per common share, or $5.9 (including dividend equivalents), which was paid on February 15, 2013 to stockholders of record at the close of business on January 25, 2013. Anti-dilution Adjustments to Convertible Notes and Convertible Note Hedge Transactions. Upon the payment of the quarterly dividend on February 15, 2013, (a) the Convertible Notes' conversion rate increased slightly to 20.7309 shares per $1,000 principal amount of the Convertible Notes and the equivalent conversion price decreased slightly to $48.24 per share, (b) the Call Options' exercise price decreased slightly to $48.24 per share, and (c) the Warrants' exercise price decreased slightly to $61.25 per share.