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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Jan. 31, 2012
quarter
Debt  
Number of consecutive fiscal quarters for interest coverage ratio 4
Minimum
 
Debt  
Consolidated leverage ratio 3.50
Maximum
 
Debt  
Consolidated interest coverage ratio 2.50
Priority debt as a percentage of consolidated net worth 25.00%
Note Purchase Agreement
 
Debt  
Senior notes 240.0
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%
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 (in days) 30
Note Purchase Agreement | Maximum
 
Debt  
Written notice period to holders of the Notes (in days) 60
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%
Additional senior notes | Maximum
 
Debt  
Senior notes 600.0