Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Net AWI Investments (Details)

v3.20.1
Summary of Significant Accounting Policies - Net AWI Investments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Adjustments related to tax attributes assumed upon spin-off $ 0.7