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Derivative Financial Instruments - Schedule of Foreign Currency Forward Contracts (Details) € in Millions, £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 GBP (£) | Jun. 30, 2015 EUR (€) | Dec. 31, 2014 USD ($)
Foreign Exchange Forward Expected to Settle Quarterly | Counterparty C |  |  |  |  |  |
Derivative |  |  |  |  |  |
Foreign currency forward liabilities at fair value | [1] | $ 1.5 | $ 1.5 |  |  | $ 0.3
Foreign Exchange Forward Expected to Settle Quarterly | Counterparty C | Paying |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | € |  |  |  |  | € 15.8 |
Foreign Exchange Forward Expected to Settle Quarterly | Counterparty C | Receiving |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount |  | 19.2 | 19.2 |  |  |
Foreign Exchange Forward Expected to Settle Monthly | Counterparty C |  |  |  |  |  |
Derivative |  |  |  |  |  |
Foreign currency forward liabilities at fair value | [1] | (0.2) | (0.2) |  |  | (0.8)
Foreign Exchange Forward Expected to Settle Monthly | Counterparty C | Paying |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount |  | 7.5 | 7.5 |  |  |
Foreign Exchange Forward Expected to Settle Monthly | Counterparty C | Receiving |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | £ |  |  |  | £ 4.7 |  |
Foreign Exchange Forward Expected To Settle July Twenty Fifteen [Member] | Counterparty C |  |  |  |  |  |
Derivative |  |  |  |  |  |
Foreign currency forward liabilities at fair value | [1] | 0.0 | 0.0 |  |  | $ 0.0
Foreign Exchange Forward Expected To Settle July Twenty Fifteen [Member] | Counterparty C | Paying |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount | £ |  |  |  | £ 2.0 |  |
Foreign Exchange Forward Expected To Settle July Twenty Fifteen [Member] | Counterparty C | Receiving |  |  |  |  |  |
Derivative |  |  |  |  |  |
Notional amount |  | 3.1 | 3.1 |  |  |
Revenue |  |  |  |  |  |
Derivative |  |  |  |  |  |
Derivative, Gain on Derivative |  | 1.1 | 1.4 |  |  |
Operating Expenses |  |  |  |  |  |
Derivative |  |  |  |  |  |
Derivative, Loss on Derivative |  | $ 0.5 | $ 1.1 |  |  |
[1] | The fair values of receivables and payables related to outstanding hedge contracts are presented within Other assets and Other liabilities, respectively. These amounts are expected to be reclassified into earnings within the next twelve months.

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