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Revenue - Telecommunications Segment Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers $ 439.9 $ 455.0 $ 844.8 $ 870.5
Net revenue 518.6 496.8 1,010.0 950.5
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 439.9 455.0 844.8 870.5
Operating Segments | Telecommunications        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers 189.3 190.5 344.8 392.8
Other revenue 0.0 0.0 0.0 0.0
Net revenue $ 189.3 $ 190.5 $ 344.8 $ 392.8