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Debt - Summary of Components of Interest Expense Related to Borrowings (Footnote) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Debt Disclosure [Abstract] | ||
| Interest expense associated with non-utilization fees | $ 0.4 | $ 0.3 |