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Debt Summary of Redemption Percentages (Details) (Senior Unsecured Notes Due April 2023, Senior Notes) | Mar. 31, 2013
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Senior Unsecured Notes Due April 2023 | Senior Notes |
Debt Instrument Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage, 2018 | 102.563%
Debt Instrument, Redemption Price, Percentage, 2019 | 101.708%
Debt Instrument, Redemption Price, Percentage, 2020 | 100.854%
Debt Instrument, Redemption Price, Percentage, 2021 and thereafter | 100.00%

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