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Property and Equipment Property and Equipment - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense for property and equipment $ 1,302.9 $ 1,227.5 $ 1,390.7