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Equity-Based Awards (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense | $ 37.3 | $ 25.5 | $ 107.8 | $ 78.8
Phantom Unit Awards [Member] |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense | 34.7 | 24.2 | 99.6 | 74.7
Profits Interest Awards [Member] |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense | 2.5 | 1.2 | 8.1 | 3.8
Liability-classified awards [Member] |  |  |  |
Equity-based compensation expense [Abstract] |  |  |  |
Total compensation expense | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.3

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