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Debt - Debt Redemption (Details) - Senior notes Due May 1, 2018 - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Nov. 30, 2014 | Dec. 31, 2014
Treasury lock | Derivatives not designated as hedging instruments | Senior notes |  |  |
Debt Instrument |  |  |
Derivative, gain on derivative |  | $ 1,200,000 |
Notional amount of derivative |  | $ 750,000,000 |
Senior notes |  |  |
Debt Instrument |  |  |
Extinguishment of debt | $ 750,000,000 |  |
Loss on extinguishment of debt |  |  | $ 131,700,000

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