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Fair Value Measurements - Changes in Fair Value of Financial Instruments Classified as Level 3 (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Contingent Consideration [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Balance, beginning of period $ (2.3)
Transfers out of Level 3 0.0 [1]
Balance, end of period (2.3)
Commodity Derivative Contracts Asset/(Liability) [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Balance, beginning of period (0.3)
Transfers out of Level 3 0.3 [1]
Balance, end of period $ 0.0
[1] Transfers relate to long-term over-the-counter swaps for NGL products for which observable market prices became available for substantially their full term.