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Leases - Summary of Maturities of Lease Liabilities Under Non-cancellable Leases (Details) $ in Millions	Dec. 31, 2020 USD ($)
Future Minimum Lease Payments - Operating Leases
2020	$ 14.1
2021	13.3
2022	11.5
2023	7.1
2024	4.2
Thereafter	15.5
Total undiscounted cash flows	65.7
Less imputed interest	(7.5)
Total lease liabilities	$ 58.2
Operating Lease, Liability, Statement of Financial Position [Extensible List]	trgp:OperatingLeaseLiabilityMember
Future Minimum Lease Payments - Finance Leases
2020	$ 13.0
2021	11.6
2022	6.0
2023	1.5
2024	0.3
Total undiscounted cash flows	32.4
Less imputed interest	(1.6)
Total lease liabilities	$ 30.8

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