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 |
| X | ||||||||||
- Definition Related Party Transaction, Adjustments to Tax Attributes Assumed from Related Party No definition available.
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| X | ||||||||||
- References No definition available.
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