Stockholders' Deficit - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Accumulated Other Comprehensive Income
Foreign translation adjustments	$ (0.4)	$ (0.1)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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