Summary of Significant Accounting Policies - Long Term Contingent Consideration (Details) - USD ($) $ in Millions |
Feb. 28, 2015 |
Jun. 02, 2012 |
|---|---|---|
| Nuclear Logistics Incorporated [Member] | ||
| Business Acquisition, Contingent Consideration [Line Items] | ||
| Future contingent consideration | $ 9.1 | $ 20.0 |