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Intangible Assets, Net (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Intangible Assets, Net [Abstract]        
Amortization expense $ 103.2 $ 107.4 $ 212.9 $ 218.0