Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Schedule of Amortization Expense (Details)

v3.8.0.1
Intangible Assets - Schedule of Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 4.2 $ 0.4 $ 0.5