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Debt - Senior Notes (Details) - US Dollar notes under the Note Purchase Agreement $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) | Jan. 31, 2012 USD ($)
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% |
Actual leverage ratio | 1.4 |
Actual interest coverage ratio | 15.7 |
Minimum |  |
Debt |  |
Written notice period to holders of the Notes | 30 days |
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%

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