Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2023 USD ($)
Recorded Unconditional Purchase Obligation [Line Items]
Estimate minimum liability for environmental remediation	$ 3.7
Project costs	55.9
Future purchase obligation first year	201.7
Future purchase obligation second year	91.1
Future purchase obligation third year	113.8
Future purchase obligation fourth year	118.3
Future purchase obligation fifth year	121.7
Future purchase obligation thereafter	768.9
Pipeline and Storage, Gathering and Utility Segments
Recorded Unconditional Purchase Obligation [Line Items]
Contract commitments first year	74.9
Contract commitments second year	8.4
Contract commitments third year	7.2
Contract commitments fourth year	5.9
Contract commitments fifth year	3.3
Contract commitments thereafter	4.7
Exploration and Production
Recorded Unconditional Purchase Obligation [Line Items]
Contract commitments first year	279.5
Contract commitments second year	185.1
Contract commitments third year	$ 47.3