CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Trade receivables, allowances	$ 0.7	$ 2.5
Targa Resources Corp. stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	450,000,000	450,000,000
Common stock, shares issued (in shares)	242,328,035	241,764,105
Common stock, shares outstanding (in shares)	217,461,060	217,763,821
Treasury stock, shares (in shares)	24,866,975	24,000,284