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Property and Equipment, Net (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property and Equipment, Net [Abstract]      
Depreciation expense $ 269.2 $ 258.4 $ 268.1
Non-cash capital expenditures $ 12.4