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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Jan. 31, 2012
Mar. 31, 2013
Minimum
   
Debt    
Consolidated interest coverage ratio   2.50
Maximum
   
Debt    
Consolidated leverage ratio   3.50
Priority debt as a percentage of consolidated net worth 25.00%  
Note Purchase Agreement
   
Debt    
Senior notes 240.0  
Additional aggregate principal amount that may be issued 600  
Percentage of principal amount to be repaid in case of prepayment 100.00%  
Percentage of principal amount to be repaid in case of prepayment and change in control 100.00%  
Period for interest coverage ratio 1 year  
Note Purchase Agreement | Minimum
   
Debt    
Prepayment of notes as a percentage of original aggregate principal amount of the Notes to be prepaid 10.00%  
Written notice period to holders of the Notes 30 days  
Note Purchase Agreement | Maximum
   
Debt    
Written notice period to holders of the Notes 60 days  
3.16% Series 2012A Senior Notes, Tranche A, due January 18, 2017
   
Debt    
Senior notes 20.0  
Interest rate, stated percentage 3.16%  
3.74% Series 2012A Senior Notes, Tranche B, due January 18, 2019
   
Debt    
Senior notes 15.0  
Interest rate, stated percentage 3.74%  
4.31% Series 2012A Senior Notes, Tranche C, due January 18, 2022
   
Debt    
Senior notes 105.0  
Interest rate, stated percentage 4.31%  
4.46% Series 2012A Senior Notes, Tranche D, due January 18, 2024
   
Debt    
Senior notes 100.0  
Interest rate, stated percentage 4.46%