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Revenues from Contracts (Contract Balances - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]    
Increase in net contract liabilities from acquisitions   $ 23.1
Contract with customer, revenues recognized $ 235.5 $ 543.7