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Debt (Build-to-suit Lease Obligation) (Details) - Discovery Hub [Member]
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Oct. 31, 2017
ft²
Debt Instrument [Line Items]    
Build to suit lease area of land | ft²   312,000
Build to suit lease project costs paid by third party owner lessor | $ $ 19