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Debt Obligations (3.875% Senior Unsecured Notes) (Details) - Senior Notes - 3.875% senior unsecured notes due June 7, 2021 $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Debt Instrument [Line Items] |
Stated rate | 3.875%
Foreign currency translation | $ 8
Maximum |
Debt Instrument [Line Items] |
Maximum interest rate on debt instrument | 5.875%

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