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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Jan. 31, 2012
US Dollar notes under the 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  
US Dollar notes under the 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  
Consolidated interest coverage ratio 2.50  
US Dollar notes under the Note Purchase Agreement | Maximum
   
Debt    
Written notice period to holders of the Notes 60 days  
Priority debt as a percentage of consolidated net worth 25.00%  
Consolidated leverage ratio 3.50  
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%