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Segment Data - Schedule of reconciliation of total costs and expenses to Fee-based operating expenses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting [Abstract]    
Total operating expenses $ 1,929.0 $ 1,849.6
Less: Gross contract costs (531.0) (521.8)
Total Fee-based operating expenses $ 1,398.0 $ 1,327.8