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Debt - Senior Notes (Details)
$ in Millions
9 Months Ended
Jan. 18, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jan. 31, 2012
USD ($)
Debt      
Principal repayment of Senior Notes   $ 20.0  
US Dollar notes under the Note Purchase Agreement      
Debt      
Senior notes     $ 240.0
Additional aggregate principal amount that may be issued   $ 600.0  
Minimum percentage of original aggregate principal that may be prepaid   10.00%  
Prepayment price as percentage of principal amount   100.00%  
Prepayment price as percentage of principal amount, in the event of a change in control   100.00%  
Maximum leverage ratio allowed   3.50  
Period for interest coverage ratio   1 year  
Minimum interest coverage ratio required   2.50  
Priority debt as a percentage of consolidated net worth   25.00%  
US Dollar notes under the Note Purchase Agreement | Minimum      
Debt      
Written notice period to holders of the Notes   30 days  
US Dollar notes under the 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 | US Dollar notes under the Note Purchase Agreement      
Debt      
Senior notes     $ 20.0
Interest rate, stated percentage     3.16%
Principal repayment of Senior Notes $ 20.0    
3.74% Series 2012A Senior Notes, Tranche B, due January 18, 2019 | US Dollar notes under the Note Purchase Agreement      
Debt      
Senior notes     $ 15.0
Interest rate, stated percentage     3.74%
4.31% Series 2012A Senior Notes, Tranche C, due January 18, 2022 | US Dollar notes under the Note Purchase Agreement      
Debt      
Senior notes     $ 105.0
Interest rate, stated percentage     4.31%
4.46% Series 2012A Senior Notes, Tranche D, due January 18, 2024 | US Dollar notes under the Note Purchase Agreement      
Debt      
Senior notes     $ 100.0
Interest rate, stated percentage     4.46%