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Fair Value Measurements - Changes in Fair Value of Financial Instruments Classified as Level 3 (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Contingent Liability [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Balance, beginning of period $ (319.4)
New Level 3 derivative instruments 0.0
Settlements included in Revenue 0.0
Unrealized gain/(loss) included in OCI 0.0
Balance, end of period (331.5)
Targa Pipeline Partners LP [Member] | Contingent Liability [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Change in fair value of contingent consideration (0.1)
Permian Acquisition [Member] | Contingent Liability [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Change in fair value of contingent consideration (12.0) [1]
Commodity Derivative Contracts Asset/(Liability) [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
New Level 3 derivative instruments (1.0)
Settlements included in Revenue 2.6
Unrealized gain/(loss) included in OCI (10.3)
Balance, end of period (12.5)
Balance, beginning of period (3.8)
Commodity Derivative Contracts Asset/(Liability) [Member] | Targa Pipeline Partners LP [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Change in fair value of contingent consideration 0.0
Commodity Derivative Contracts Asset/(Liability) [Member] | Permian Acquisition [Member]  
Changes in fair value of financial instruments classified as Level 3 in fair value hierarchy [Roll Forward]  
Change in fair value of contingent consideration $ 0.0 [1]
[1] Represents the change in fair value between December 31, 2017 and September 30, 2018 of the contingent consideration that arose as part of the Permian Acquisition in the first quarter of 2017. See Note 4 – Newly-Formed Joint Ventures, Acquisitions and Divestitures for discussion of the initial fair value.