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Revenues from Contracts (Contract Balances - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]        
Contract with customer, revenues recognized $ 272.1 $ 211.5 $ 731.2 $ 535.0