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EPS impact of Convertible Debt (Details) (3.25% Senior Subordinated Convertible Notes Due 2024 [Member], USD $)
Share data in Millions
12 Months Ended
Dec. 31, 2010
Nov. 09, 2006
Dec. 31, 2010
$40.20
Dec. 31, 2010
$41.20
Dec. 31, 2010
$45.00
Dec. 31, 2010
$50.00
Dec. 31, 2010
$55.00
Dec. 31, 2010
$60.00
Dec. 31, 2010
$65.00
Dec. 31, 2010
$70.00
Schedule of Convertible Debt Potential Share Increase [Line Items]                    
Principal Outstanding $ 329,300,000                  
Conversion Price per Share 40.20 40.20                
Trigger Price $ 48.24 $ 48.24                
Total Potential Shares     0 0.2 0.9 1.6 2.2 2.7 3.1 3.5