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Convertible Securities (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
security
Dec. 31, 2011
Convertible Securities    
Carrying Value $ 439,200,000 $ 435,600,000
Carrying Value 513,300,000 512,600,000
Principal amount at maturity 730,800,000 730,800,000
Principal terms of Convertible Debt Securities    
Deferred tax liabilities 24,500,000  
2008 senior convertible notes
    
Debt    
Number of securities outstanding 1  
Convertible Securities    
Carrying Value 439,200,000 435,600,000
Principal amount at maturity 460,000,000 460,000,000
Term of debt (in years) 5 years  
Principal terms of Convertible Debt Securities    
Denomination 1,000  
Current conversion rate 7.959  
Current conversion price (in dollars per share) $ 125.65  
Stated coupon (as a percent) 3.95%  
Tax deduction rate (as a percent) 9.38%  
Junior convertible trust preferred securities
    
Debt    
Number of securities outstanding 2  
2007 junior convertible trust preferred securities
    
Convertible Securities    
Carrying Value 298,200,000 297,800,000
Principal amount at maturity 430,800,000 430,800,000
Term of debt (in years) 30 years  
Principal terms of Convertible Debt Securities    
Denomination 50  
Current conversion rate 0.250  
Current conversion price (in dollars per share) $ 200.00  
Stated coupon (as a percent) 5.15%  
Tax deduction rate (as a percent) 8.00%  
Minimum stock price for convertible notes to be redeemed (in dollars per share) $ 260  
2006 junior convertible trust preferred securities
    
Convertible Securities    
Carrying Value 215,100,000 214,800,000
Principal amount at maturity 300,000,000 300,000,000
Term of debt (in years) 30 years  
Principal terms of Convertible Debt Securities    
Denomination $ 50  
Current conversion rate 0.333  
Current conversion price (in dollars per share) $ 150.00  
Stated coupon (as a percent) 5.10%  
Tax deduction rate (as a percent) 7.50%  
Minimum stock price for convertible notes to be redeemed (in dollars per share) $ 195