Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - Foreign - USD ($) $ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Restricted Cash and Cash Equivalents Items [Line Items] | ||
| Cash and restricted cash accounts | $ 2.4 | $ 5.4 |
| Restricted cash accounts | $ 0.4 | $ 0.6 |