CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Trade receivables, allowances	$ 2.5	$ 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)	241,764,105	240,095,699
Common stock, shares outstanding (in shares)	217,763,821	222,611,259
Treasury stock, shares (in shares)	24,000,284	17,484,440