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Commitments and Contingencies - Sublease (Details) - Corporate Offices, Sublease
$ in Millions
Sep. 30, 2019
USD ($)
ft²
Operating Leased Assets [Line Items]  
Leased space (in square feet) | ft² 25,212
Operating lease, sublease, base rent per annum, through year five $ 1.3
Operating lease, sublease, base rent per annum, after year five $ 1.4