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 |