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Long-term Debt (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Debt Instrument    
Total long-term debt $ 1,616.4 $ 1,622.2
Less: current portion 448.6 [1] 38.9 [1]
Long-term debt, excluding current portion 1,167.8 1,583.3
7.25% Senior Unsecured Notes due 2011
   
Debt Instrument    
Effective Interest Rate 7.25% [2]  
Stated Interest Rate 7.25%  
Debt Maturity Date Aug. 15, 2011  
Book Value 36.3 36.3
Fair Value 36.3 [3] 37.0 [3]
6.25% Senior Unsecured Notes due 2014
   
Debt Instrument    
Effective Interest Rate 6.29% [2]  
Stated Interest Rate 6.25%  
Debt Maturity Date Nov. 15, 2014  
Book Value 355.0 353.3
Fair Value 385.9 [3] 378.0 [3]
Unamortized Discount 0.3  
Face Value 350.0  
10.00% Senior Unsecured Notes due 2017
   
Debt Instrument    
Effective Interest Rate 10.38%  
Stated Interest Rate 10.00%  
Debt Maturity Date Jul. 15, 2017  
Book Value 590.0 589.4
Fair Value 703.5 [3] 705.0 [3]
Unamortized Discount 10.0  
4.75% Convertible Senior Notes due 2023
   
Debt Instrument    
Effective Interest Rate 3.50%  
Stated Interest Rate 4.75%  
Debt Maturity Date Mar. 15, 2023  
Book Value 203.8 205.0
Fair Value 249.1 [3] 235.0 [3]
Unamortized Premium 3.8  
Capped call, shares that may be purchased 16.3  
Capped call, strike price before adjustment $ 12.42  
Capped call, strike price $ 12.30  
Capped call, cap price before adjustment $ 18.26  
Capped call, cap price $ 18.08  
4.25% Convertible Senior Notes due 2023
   
Debt Instrument    
Effective Interest Rate 0.58%  
Stated Interest Rate 4.25%  
Debt Maturity Date Mar. 15, 2023  
Book Value 410.2 417.4
Fair Value 452.5 [3] 444.4 [3]
Unamortized Premium 10.2  
Call Date of Convertible Senior Notes Mar. 15, 2012  
Other notes payable and capitalized leases
   
Debt Instrument    
Book Value $ 21.1 $ 20.8
[1] On March 15, 2012, holders of our 4.25% Convertible Senior Notes due 2023 (the “4.25% Notes”) may require us to repurchase their notes for cash at par and as such, we included these notes in the current portion of long-tern debt on our June 30, 2011 unaudited Consolidated Balance Sheet. Any 4.25% Notes not repurchased on March 15, 2012 will be reclassified to long-term debt.
[2] Excludes the effect of related interest rate swaps.
[3] Fair values are derived from trading quotes by institutions making a market in the securities and estimations of value by those institutions using proprietary models.