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Convertible Securities - Schedule of carrying amount and fair value of convertible notes (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
2008 senior convertible notes [Member]
Dec. 31, 2012
2008 senior convertible notes [Member]
Dec. 31, 2013
Junior convertible trust preferred securities [Member]
junior_note
Dec. 31, 2013
2007 junior convertible trust preferred securities [Member]
Dec. 31, 2012
2007 junior convertible trust preferred securities [Member]
Dec. 31, 2013
2006 junior convertible trust preferred securities [Member]
Dec. 31, 2012
2006 junior convertible trust preferred securities [Member]
Deb Instrument [Line Items]                  
Repurchased face amount     $ 460,000,000            
Interest rate     3.95%     5.15% [1]   5.10% [2]  
Repurchase amount     641,300,000            
Number of securities outstanding         2        
Senior convertible securities, Carrying Value     0 [3] 450,100,000 [3]          
Junior convertible trust preferred securities, Carrying Value 518,700,000 515,500,000       301,200,000 [1],[3],[4] 299,400,000 [3] 217,500,000 [2],[3],[4] 216,100,000 [3]
Principal amount at maturity $ 730,800,000 $ 730,800,000 $ 0 [3] $ 460,000,000 [3]   $ 430,800,000 [1],[3] $ 430,800,000 [3] $ 300,000,000 [2],[3] $ 300,000,000 [3]
Debt instrument term         30 years        
[1] The Company may redeem the 2007 junior convertible trust preferred securities if the closing price of the Company's common stock exceeds $260 per share for 20 trading days in a period of 30 consecutive trading days.
[2] On February 13, 2014, we delivered a notice to redeem all of our outstanding 2006 convertible trust preferred securities. In lieu of redemption, holders of the 2006 junior convertible trust preferred securities may elect to convert their securities into a defined number of shares. Upon conversion, holders will receive cash or shares of our common stock, or a combination thereof, at our election.
[3] Carrying value is accreted to the principal amount at maturity over an expected life of 30 years for each of the junior convertible trust preferred securities.
[4] The carrying value is accreted to the principal amount at maturity over an expected life of 30 years for each of the junior convertible trust preferred securities.